diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 40952cc..416dc1c 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -31,3 +31,13 @@ repos:
         language: system
         pass_filenames: false
         types: [markdown]
+
+      # always_run, not types: [markdown] — what breaks this gate is adding a
+      # script under src/just_bashit/, and that commit touches no markdown at
+      # all. A markdown-scoped hook would have stayed silent for make-run.
+      - id: docs-coverage
+        name: docs-coverage
+        entry: make -s docs-coverage
+        language: system
+        pass_filenames: false
+        always_run: true
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1bc3aed..87f8670 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,37 @@
 
 ## [Unreleased]
 
+### Added
+
+- **`make-run` is documented.** It shipped in 0.4.0 as the headline feature
+    and appeared in no page, no nav entry, and no line of the README — so the
+    one tool whose whole purpose is ending hand-transcribed commands could
+    only be found by reading its source. New page under Libraries covering
+    `mk-var`, `mk-vars`, `mk-run`, `mk-has` and `mk-origin`, the
+    undefined-is-not-empty rule, and why the queries avoid `--eval`.
+
+- **`docs-coverage` gate.** Two invariants, one for each way the above went
+    unnoticed: every file shipped in `src/just_bashit/` must be named
+    somewhere in the docs, and every page under `docs/` must be reachable
+    from `zensical.toml`'s nav. `docs/changelog.md` is excluded as a mention
+    source — it records every script ever added, so counting it would pass
+    everything the moment it was released. Dispatched from pre-commit with
+    `always_run`, so it runs inside `make lint` (which CI runs) and fires on
+    commits touching no markdown, which is what adding a script looks like.
+
+### Fixed
+
+- **The docs pointed at `src/`, where nothing has lived since 0.2.0.**
+    Scripts moved to `src/just_bashit/` for Python packaging and the docs kept
+    the old path, so every `. just-bashit/src/datetime.sh` in the README, the
+    getting-started guide, and all ten library pages failed for anyone who
+    copied one — including from an unpacked release tarball, which carries the
+    current layout.
+
+- **The README described a package layout that no longer existed**, and never
+    mentioned installation, the `jb` / `jbx` / `jb-inspect` entry points, or
+    `make-run`.
+
 ## [0.4.0] - 2026-08-06
 
 ### Added
diff --git a/Makefile b/Makefile
index b869fd4..bfeb6ac 100644
--- a/Makefile
+++ b/Makefile
@@ -63,6 +63,19 @@ else \
 fi
 endef
 
+# ── docs coverage ─────────────────────────────────────────────────────────────
+# A repo-local target, so it needs naming here or help-check reports a rule
+# that help does not list.
+#
+# Dispatched from .pre-commit-config.yaml rather than DOCS_CHECK_PRE_CMDS: CI
+# runs `make test`, `make coverage` and `make lint` — not `make docs-check` —
+# so a docs gate hung off docs-check would be local-only, which is how a rule
+# nobody enforces sits on main indefinitely.
+LOCAL_TARGETS += docs-coverage
+
+docs-coverage: ## Verify every shipped script is documented and in the nav
+	@bash scripts/docs_coverage.sh
+
 # ── all ───────────────────────────────────────────────────────────────────────
 # Lint first: shellcheck and shfmt are seconds, the bats suite is minutes.
 #
diff --git a/README.md b/README.md
index df2e2e5..6837881 100644
--- a/README.md
+++ b/README.md
@@ -17,14 +17,31 @@ Evolving set of [shfmt](https://github.com/mvdan/sh#shfmt)-conformant, [bats](ht
 
 **[Documentation](https://just-buildit.github.io/just-bashit/)**
 
+## Install
+
+```bash
+uv tool install just-bashit   # or: pip install just-bashit
+```
+
+That puts three commands on `PATH`: `jb` (top-level CLI), `jbx` (ephemeral
+runner — fetch a script, call a function, discard), and `jb-inspect`.
+
+Nothing needs installing to *use* a script. `jbx` fetches on demand:
+
+```bash
+jbx install-deps                              # install this repo's packages
+jbx make-run mk-var -C ~/doppler DOCS_BUILD_CMD
+```
+
 ## Getting Started
 
-A release package contains shell libraries along with a script and two function templates for developing your own tools.
+A release package contains shell libraries along with script and function
+templates for developing your own tools.
 
 ```
 just-bashit
     +--README.md
-    +--src/
+    +--src/just_bashit/
     |   +-- datetime.sh
     |   +-- environment.sh
     :   :
@@ -36,7 +53,23 @@ just-bashit
 Some libraries depend on others so it's best to use the whole package and source whatever you need, for example:
 
 ```bash
-. just-bashit/src/datetime.sh # contains iso-8601-basic()
+. just-bashit/src/just_bashit/datetime.sh # contains iso-8601-basic()
 iso-8601-basic -d '10:32 AM EDT Jan 5 1982'
 19820105T143200Z
 ```
+
+## Ask a repo what its commands are
+
+`make-run` resolves a repository's targets and command variables from that
+repository's own `Makefile`, so nothing downstream has to carry a second copy
+of a command that will drift from it:
+
+```bash
+jbx make-run mk-var -C ~/doppler DOCS_BUILD_CMD
+# uv run --group docs zensical build --clean --strict
+
+jbx make-run mk-run -C ~/doppler docs   # run it, whatever it is
+```
+
+An **undefined** variable is an error, never an empty string — see
+[the docs](https://just-buildit.github.io/just-bashit/libraries/make-run/).
diff --git a/docs/getting-started.md b/docs/getting-started.md
index 6515121..3f35d7d 100644
--- a/docs/getting-started.md
+++ b/docs/getting-started.md
@@ -35,8 +35,8 @@ All libraries **must be sourced**, not executed. Each file enforces this at
 load time and will exit with an error if you try to run it directly.
 
 ```bash
-. just-bashit/src/logging.sh   # correct
-bash just-bashit/src/logging.sh # error: "This file must be sourced."
+. just-bashit/src/just_bashit/logging.sh   # correct
+bash just-bashit/src/just_bashit/logging.sh # error: "This file must be sourced."
 ```
 
 Some libraries depend on others (`logging.sh` sources `format.sh`,
@@ -49,7 +49,7 @@ chain resolves automatically from relative paths.
 Every function accepts `-h`:
 
 ```bash
-. just-bashit/src/datetime.sh
+. just-bashit/src/just_bashit/datetime.sh
 iso-8601-basic -h
 ```
 
diff --git a/docs/index.md b/docs/index.md
index 0e63d90..99ec7b9 100644
--- a/docs/index.md
+++ b/docs/index.md
@@ -29,7 +29,7 @@ Download the latest release, extract it, and source whatever you need:
 
 ```bash
 tar xf just-bashit.tar.gz
-. just-bashit/src/datetime.sh
+. just-bashit/src/just_bashit/datetime.sh
 iso-8601-basic
 # 20260522T143200Z
 ```
@@ -61,6 +61,7 @@ package and source individual files from it.
 | [file](libraries/file.md)               | `add-line` `remove-line` `add-contents`                 |
 | [format](libraries/format.md)           | `trim-from` `color-echo`                                |
 | [logging](libraries/logging.md)         | `log` `log-wait`                                        |
+| [make-run](libraries/make-run.md)       | `mk-var` `mk-vars` `mk-run` `mk-has` `mk-origin`        |
 | [match](libraries/match.md)             | `is-number`                                             |
 | [network](libraries/network.md)         | `test-internet-access`                                  |
 | [path](libraries/path.md)               | `get-scriptpath` `set-scriptpath`                       |
diff --git a/docs/inspect.md b/docs/inspect.md
index d33aabc..6929dee 100644
--- a/docs/inspect.md
+++ b/docs/inspect.md
@@ -263,5 +263,5 @@ jbx inspect -v 2>&1 | head
 jbx inspect | diff jb.versions -
 
 # Pin script to a specific commit for reproducible CI output
-jbx gh:just-buildit/just-bashit/src/inspect.sh@abc1234 -w
+jbx gh:just-buildit/just-bashit/src/just_bashit/inspect.sh@abc1234 -w
 ```
diff --git a/docs/install-deps.md b/docs/install-deps.md
index 25ce1c5..36dd04a 100644
--- a/docs/install-deps.md
+++ b/docs/install-deps.md
@@ -282,7 +282,7 @@ jbx install-deps --template deps.toml  # write to file
 ### Pin to a specific script commit for reproducible CI
 
 ```bash
-jbx gh:just-buildit/just-bashit/src/install-deps.sh@abc1234
+jbx gh:just-buildit/just-bashit/src/just_bashit/install-deps.sh@abc1234
 ```
 
 ______________________________________________________________________
diff --git a/docs/just-runit.md b/docs/just-runit.md
index 5dc2d8b..c0f4395 100644
--- a/docs/just-runit.md
+++ b/docs/just-runit.md
@@ -155,7 +155,7 @@ used.
 # See which URL a cache file came from and when it was fetched
 cat ~/.cache/just-runit/<sha256>.meta
 # ts=1779583354
-# url=https://raw.githubusercontent.com/just-buildit/just-bashit/main/src/install-deps.sh
+# url=https://raw.githubusercontent.com/just-buildit/just-bashit/main/src/just_bashit/install-deps.sh
 ```
 
 **Force a fresh fetch (keep the entry, overwrite it)**
@@ -173,7 +173,7 @@ jbx -n https://example.com/tool.sh run
 **Purge a single entry**
 
 ```bash
-jb cache clear https://raw.githubusercontent.com/just-buildit/just-bashit/main/src/install-deps.sh
+jb cache clear https://raw.githubusercontent.com/just-buildit/just-bashit/main/src/just_bashit/install-deps.sh
 ```
 
 Or manually — find the hash with `-v` then remove the pair:
diff --git a/docs/libraries/datetime.md b/docs/libraries/datetime.md
index adf963b..d737c04 100644
--- a/docs/libraries/datetime.md
+++ b/docs/libraries/datetime.md
@@ -1,13 +1,13 @@
 # datetime
 
-Source: `src/datetime.sh`
+Source: `src/just_bashit/datetime.sh`
 
 ## iso-8601-basic
 
 Generate a path- and filename-friendly ISO 8601 UTC timestamp.
 
 ```bash
-. just-bashit/src/datetime.sh
+. just-bashit/src/just_bashit/datetime.sh
 iso-8601-basic
 # 20260522T143200Z
 ```
diff --git a/docs/libraries/environment.md b/docs/libraries/environment.md
index d971645..c3a631e 100644
--- a/docs/libraries/environment.md
+++ b/docs/libraries/environment.md
@@ -1,6 +1,6 @@
 # environment
 
-Source: `src/environment.sh`
+Source: `src/just_bashit/environment.sh`
 
 Idempotent management of `~/.bashrc` entries and command existence checks.
 
@@ -11,7 +11,7 @@ ______________________________________________________________________
 Write a line to `~/.bashrc` only if it is not already present.
 
 ```bash
-. just-bashit/src/environment.sh
+. just-bashit/src/just_bashit/environment.sh
 
 # Write a verbatim line
 set-bashrc 'alias ll="ls -la"'
@@ -45,7 +45,7 @@ ______________________________________________________________________
 Remove a line from `~/.bashrc` if present. No-op if not found.
 
 ```bash
-. just-bashit/src/environment.sh
+. just-bashit/src/just_bashit/environment.sh
 
 # Remove a verbatim line
 unset-bashrc 'alias ll="ls -la"'
@@ -79,7 +79,7 @@ ______________________________________________________________________
 Return 0 if a command is available in `PATH`, 1 otherwise.
 
 ```bash
-. just-bashit/src/environment.sh
+. just-bashit/src/just_bashit/environment.sh
 
 check-command-exists curl && echo "curl is available"
 check-command-exists nonexistent || echo "not found"
diff --git a/docs/libraries/file.md b/docs/libraries/file.md
index 8c04c0a..97c4ce4 100644
--- a/docs/libraries/file.md
+++ b/docs/libraries/file.md
@@ -1,6 +1,6 @@
 # file
 
-Source: `src/file.sh`
+Source: `src/just_bashit/file.sh`
 
 Idempotent line-level file content management.
 
@@ -12,7 +12,7 @@ Write a line to a file only if it is not already present. Optionally write a
 blank line.
 
 ```bash
-. just-bashit/src/file.sh
+. just-bashit/src/just_bashit/file.sh
 
 # Append a line (idempotent — safe to call repeatedly)
 add-line "export PATH=$PATH:/opt/myapp/bin" /etc/environment
@@ -48,7 +48,7 @@ ______________________________________________________________________
 Remove a line from a file if present. No-op if not found.
 
 ```bash
-. just-bashit/src/file.sh
+. just-bashit/src/just_bashit/file.sh
 
 remove-line "export PATH=$PATH:/opt/myapp/bin" /etc/environment
 
@@ -82,7 +82,7 @@ ______________________________________________________________________
 Copy every line from one file into another, skipping duplicates.
 
 ```bash
-. just-bashit/src/file.sh
+. just-bashit/src/just_bashit/file.sh
 
 # Merge new.conf into existing.conf without duplicating lines
 add-contents new.conf existing.conf
diff --git a/docs/libraries/format.md b/docs/libraries/format.md
index c38ae4d..79caae3 100644
--- a/docs/libraries/format.md
+++ b/docs/libraries/format.md
@@ -1,6 +1,6 @@
 # format
 
-Source: `src/format.sh`
+Source: `src/just_bashit/format.sh`
 
 String trimming and colorized output.
 
@@ -12,7 +12,7 @@ Trim a string at a marker character, from either direction, with optional
 greedy and keep-marker modes.
 
 ```bash
-. just-bashit/src/format.sh
+. just-bashit/src/just_bashit/format.sh
 
 trim-from 'report.2026.tar.gz'    # report.2026.tar
 trim-from -r 'report.2026.tar.gz' # 2026.tar.gz
@@ -53,7 +53,7 @@ ______________________________________________________________________
 Print colorized text to stdout using ANSI escape sequences.
 
 ```bash
-. just-bashit/src/format.sh
+. just-bashit/src/just_bashit/format.sh
 
 color-echo -bc green "Build succeeded"
 color-echo -bc red "Build failed"
diff --git a/docs/libraries/logging.md b/docs/libraries/logging.md
index 30b2911..2ed00db 100644
--- a/docs/libraries/logging.md
+++ b/docs/libraries/logging.md
@@ -1,6 +1,6 @@
 # logging
 
-Source: `src/logging.sh`
+Source: `src/just_bashit/logging.sh`
 
 Structured, colorized logging with timestamps. Depends on `format.sh`,
 `match.sh`, and `datetime.sh` — all resolved automatically from relative paths.
@@ -12,7 +12,7 @@ ______________________________________________________________________
 Log a message to stdout with a timestamp and type label.
 
 ```bash
-. just-bashit/src/logging.sh
+. just-bashit/src/just_bashit/logging.sh
 
 log "Starting deployment"
 # [20260522T143200Z::INFO]::Starting deployment
@@ -74,7 +74,7 @@ ______________________________________________________________________
 Sleep for a given duration with input validation.
 
 ```bash
-. just-bashit/src/logging.sh
+. just-bashit/src/just_bashit/logging.sh
 
 log-wait 5      # sleep 5 seconds
 log-wait 0.5    # sleep 500ms
diff --git a/docs/libraries/make-run.md b/docs/libraries/make-run.md
new file mode 100644
index 0000000..2ffb92c
--- /dev/null
+++ b/docs/libraries/make-run.md
@@ -0,0 +1,166 @@
+# make-run
+
+Source: `src/just_bashit/make-run.sh`
+
+Ask a repository what its commands actually are, instead of transcribing
+them. A repo bases its `Makefile` on
+[`standard.mk`](https://just-buildit.github.io/standard.mk), which defines
+the sanctioned defaults with `?=`; the repo then overrides what it must.
+`make-run` reads the result of that layering, so there is no second copy to
+vendor and nothing to keep in sync.
+
+The problem it removes is drift. A skill doc said `make docs` runs
+`uv run zensical build --clean`, the sanctioned default was
+`uv run --group dev zensical build --clean --strict`, and doppler — which
+overrides `ZENSICAL` — actually ran `uv run --group docs ...`. Three answers,
+two wrong, and nothing to make them disagree out loud.
+
+```bash
+jbx make-run mk-var -C ~/doppler DOCS_BUILD_CMD
+# uv run --group docs zensical build --clean --strict
+```
+
+______________________________________________________________________
+
+## Functions
+
+| Function                       | Answers                                      |
+| ------------------------------ | -------------------------------------------- |
+| `mk-var [-C DIR] NAME`         | What is `NAME` set to, fully expanded?       |
+| `mk-vars [-C DIR] [REGEX]`     | What is every file-defined variable set to?  |
+| `mk-run [-C DIR] TARGET [...]` | Run `TARGET` with the repo's own recipe      |
+| `mk-has [-C DIR] TARGET`       | Does the repo define `TARGET`? (predicate)   |
+| `mk-origin [-C DIR] NAME`      | Where did make get `NAME` — file, default, … |
+
+Every function takes `-C DIR` (default: the current directory) and `-h`.
+Nothing is built and no recipe is run, except by `mk-run`, which is the one
+function that is supposed to.
+
+______________________________________________________________________
+
+## Usage
+
+`make-run.sh` is a library: it must be sourced, and it calls no other
+just-bashit library. Either run it ephemerally through
+[`jbx`](../just-runit.md), which sources the script and invokes the named
+function:
+
+```bash
+jbx make-run mk-var -C ~/doppler DOCS_BUILD_CMD
+jbx make-run mk-has -C ~/doppler docs && echo "doppler builds docs"
+jbx just-bashit:make-run -l          # list the functions it defines
+```
+
+or source it into a shell that needs several of the functions:
+
+```bash
+. just-bashit/src/just_bashit/make-run.sh
+
+mk-run -C ~/doppler docs
+```
+
+______________________________________________________________________
+
+## The load-bearing rule: undefined is not empty
+
+`mk-var` **fails** when a variable was never defined, and **succeeds
+printing an empty line** when it was defined as empty:
+
+```bash
+mk-var -C ~/doppler DOCS_CHECK_CMD   # legitimately empty → exit 0, blank line
+mk-var -C ~/doppler DOSC_BUILD_CMD   # typo, undefined    → exit 1, message
+# make-run: DOSC_BUILD_CMD is not defined in /home/you/doppler
+```
+
+Collapsing those two states is how a wrong command reads as a blank one — a
+caller publishes an empty string where a real command belongs and nothing
+looks broken. `mk-var` asks make's own `$(origin)` first, which is the only
+reliable way to tell the two apart. `mk-origin` exposes that answer directly:
+
+```bash
+mk-origin -C ~/doppler DOCS_BUILD_CMD   # file
+mk-origin -C ~/doppler CC               # default
+mk-origin -C ~/doppler NOPE             # undefined
+```
+
+The same rule applies one level down. An unparseable makefile fails loudly
+rather than handing back an empty database: `make -pRrq` exits 1 in question
+mode, which is normal and ignored, and 2 when it cannot read the makefiles
+at all, which is reported.
+
+______________________________________________________________________
+
+## Examples
+
+### Read one command
+
+```bash
+mk-var -C ~/doppler DOCS_BUILD_CMD
+# uv run --group docs zensical build --clean --strict
+```
+
+### Read a whole family of them
+
+`mk-vars` takes no built-in list of "interesting" variables — such a list
+would be exactly the hand-maintained copy this library exists to abolish.
+Filter by name with an ERE instead, and note that all values resolve in a
+single `make` invocation:
+
+```bash
+mk-vars -C ~/doppler '_CMD$'
+# DOCS_BUILD_CMD=uv run --group docs zensical build --clean --strict
+# TEST_CMD=ctest --test-dir build --output-on-failure
+```
+
+### Run a target without knowing its recipe
+
+```bash
+mk-run -C ~/doppler docs
+```
+
+`mk-run docs` runs whatever *that* repo means by `docs`, so a caller never
+needs to know the command and therefore can never drift from it. The target
+is verified to exist first, so a rename fails with a useful message instead
+of make's `No rule to make target`. Arguments after the target pass straight
+through to make:
+
+```bash
+mk-run -C ~/doppler test -j8
+```
+
+### Branch on whether a repo supports something
+
+```bash
+if mk-has -C "${repo}" docs-check; then
+    mk-run -C "${repo}" docs-check
+fi
+```
+
+`mk-has` reads make's target database rather than dry-running, so a target
+with a missing prerequisite still answers honestly instead of erroring.
+
+______________________________________________________________________
+
+## Requirements
+
+- **GNU make 3.81 or later.** The library expands its queries through a
+    throwaway sentinel makefile passed alongside the repo's own via `-f`,
+    rather than `--eval`, which arrived in 3.82 — macOS still ships 3.81 as
+    `/usr/bin/make`, so an `--eval` implementation passes every Linux runner
+    and fails only on the platform most likely to be running an old make.
+- **A makefile in `DIR`.** `GNUmakefile`, `makefile`, or `Makefile`, in
+    make's own search order. Anything else exits 1 with
+    `make-run: no makefile in DIR`.
+- `standard.mk` is not required. Any makefile can be queried; the defaults
+    layering is simply what makes the answers worth asking for.
+
+______________________________________________________________________
+
+## What it does not do
+
+Nothing is built by `mk-var`, `mk-vars`, `mk-has`, or `mk-origin`. The
+sentinel target is `.PHONY` with a no-op recipe, so make neither reports it
+up to date nor runs any real recipe — the expansion happens at recipe run
+time, which is what lets `$(info ...)` observe fully-layered values.
+Evaluating the same expression while the makefiles are still being read
+yields nothing, because the variables do not exist yet.
diff --git a/docs/libraries/match.md b/docs/libraries/match.md
index f422f98..02006a9 100644
--- a/docs/libraries/match.md
+++ b/docs/libraries/match.md
@@ -1,6 +1,6 @@
 # match
 
-Source: `src/match.sh`
+Source: `src/just_bashit/match.sh`
 
 Regex pattern constants and numeric validation.
 
@@ -18,7 +18,7 @@ Exported variables for use in `[[ =~ ]]` expressions:
 | `IS_ONLY_SIGNED_NUMBER` | `IS_SIGNED_NUMBER` anchored to full string            |
 
 ```bash
-. just-bashit/src/match.sh
+. just-bashit/src/just_bashit/match.sh
 
 [[ "3.14" =~ $IS_ONLY_NUMBER ]] && echo "numeric"
 [[ "-7"   =~ $IS_ONLY_SIGNED_NUMBER ]] && echo "signed numeric"
@@ -31,7 +31,7 @@ ______________________________________________________________________
 Return 0 (PASS) if a string is a valid number, 1 (FAIL) otherwise.
 
 ```bash
-. just-bashit/src/match.sh
+. just-bashit/src/just_bashit/match.sh
 
 is-number 42      # PASS
 is-number 3.14    # PASS
diff --git a/docs/libraries/network.md b/docs/libraries/network.md
index a4bce27..5a6d5d6 100644
--- a/docs/libraries/network.md
+++ b/docs/libraries/network.md
@@ -1,6 +1,6 @@
 # network
 
-Source: `src/network.sh`
+Source: `src/just_bashit/network.sh`
 
 Network connectivity testing. Depends on `format.sh` and `environment.sh`.
 
@@ -13,7 +13,7 @@ Test internet connectivity by probing URLs with `curl`, `wget`, and/or `ping`
 timeout.
 
 ```bash
-. just-bashit/src/network.sh
+. just-bashit/src/just_bashit/network.sh
 
 # Silent check — returns 0/1
 test-internet-access && echo "online" || echo "offline"
diff --git a/docs/libraries/path.md b/docs/libraries/path.md
index 1e84e04..1e48322 100644
--- a/docs/libraries/path.md
+++ b/docs/libraries/path.md
@@ -1,6 +1,6 @@
 # path
 
-Source: `src/path.sh`
+Source: `src/just_bashit/path.sh`
 
 Resolve the directory containing the calling script, regardless of how it was
 invoked (executed or sourced, symlinked or direct).
@@ -13,7 +13,7 @@ Print the absolute, symlink-resolved path to the directory containing the
 calling script.
 
 ```bash
-. just-bashit/src/path.sh
+. just-bashit/src/just_bashit/path.sh
 
 # In your own script:
 SCRIPTDIR=$(get-scriptpath)
@@ -45,7 +45,7 @@ Set the `SCRIPTPATH` environment variable to the calling script's directory.
 Must be called via `eval` so the export propagates to the calling environment.
 
 ```bash
-. just-bashit/src/path.sh
+. just-bashit/src/just_bashit/path.sh
 
 eval $(set-scriptpath)
 echo "${SCRIPTPATH}"  # /absolute/path/to/your/script/dir
diff --git a/docs/libraries/pkg.md b/docs/libraries/pkg.md
index ffc7723..fbec6f9 100644
--- a/docs/libraries/pkg.md
+++ b/docs/libraries/pkg.md
@@ -1,6 +1,6 @@
 # pkg
 
-Source: `src/pkg.sh`
+Source: `src/just_bashit/pkg.sh`
 
 Package manager detection and installed-version querying.
 
@@ -12,7 +12,7 @@ Print the name of the active package manager for the running OS.
 Returns non-zero and prints to stderr if the OS is unrecognised.
 
 ```bash
-. just-bashit/src/pkg.sh
+. just-bashit/src/just_bashit/pkg.sh
 
 pm=$(get-pkg-mgr)          # e.g. "pacman" on Arch, "apt" on Debian
 echo "Using ${pm}"
@@ -52,7 +52,7 @@ Print the installed version of a package using the specified package manager.
 Prints nothing (not an error) if the package is not installed.
 
 ```bash
-. just-bashit/src/pkg.sh
+. just-bashit/src/just_bashit/pkg.sh
 
 get-pkg-version apt curl           # e.g. "8.5.0-2"
 get-pkg-version pacman bash        # e.g. "5.2.37-1"
diff --git a/docs/libraries/toml.md b/docs/libraries/toml.md
index 198ed50..5abe93a 100644
--- a/docs/libraries/toml.md
+++ b/docs/libraries/toml.md
@@ -1,6 +1,6 @@
 # toml
 
-Source: `src/toml.sh`
+Source: `src/just_bashit/toml.sh`
 
 Pure-bash parser for the TOML subset used by just-bashit dependency files:
 `[group.pm]` sections with `packages = [...]` and `cmd = [...]` arrays.
@@ -14,7 +14,7 @@ Extract each double-quoted string value from a TOML fragment, one per line.
 Skips empty quoted strings.
 
 ```bash
-. just-bashit/src/toml.sh
+. just-bashit/src/just_bashit/toml.sh
 
 toml_strings '"curl", "wget"'       # prints: curl\nwget
 toml_strings '"a", "", "b"'         # prints: a\nb  (empty string skipped)
diff --git a/docs/templates.md b/docs/templates.md
index 4cfbb58..73f6f88 100644
--- a/docs/templates.md
+++ b/docs/templates.md
@@ -1,7 +1,7 @@
 # Templates
 
-Source: `src/function-template.sh`, `src/script-template`,
-`src/bashrc-template.sh`, `src/profile-template.sh`
+Source: `src/just_bashit/function-template.sh`, `src/just_bashit/script-template`,
+`src/just_bashit/bashrc-template.sh`, `src/just_bashit/profile-template.sh`
 
 Copy-paste starting points for new bash functions and scripts, plus the
 opinionated shell configuration [`setup-system`](setup-system.md) installs.
@@ -16,7 +16,7 @@ getopts-based option parsing, a heredoc help string, variable initialization
 before and after `getopts`, and a nested helper function.
 
 ```bash
-. just-bashit/src/function-template.sh
+. just-bashit/src/just_bashit/function-template.sh
 
 full-on-template -h  # show usage
 full-on-template -p myvalue arg1 arg2
@@ -32,7 +32,7 @@ A stripped-down function template for simple functions that don't need the
 full getopts machinery.
 
 ```bash
-. just-bashit/src/function-template.sh
+. just-bashit/src/just_bashit/function-template.sh
 
 minimalist-template -h
 minimalist-template arg1
@@ -53,7 +53,7 @@ An executable script template (not a library) demonstrating:
 
 ```bash
 # Copy and rename
-cp just-bashit/src/script-template my-script
+cp just-bashit/src/just_bashit/script-template my-script
 chmod +x my-script
 ./my-script -h
 ```
diff --git a/scripts/docs_coverage.sh b/scripts/docs_coverage.sh
new file mode 100644
index 0000000..10b54fe
--- /dev/null
+++ b/scripts/docs_coverage.sh
@@ -0,0 +1,85 @@
+#!/usr/bin/env bash
+# ############################################################################
+# docs_coverage.sh — repo gate, not a shipped library.                       #
+# ############################################################################
+# Two invariants, because make-run shipped in 0.4.0 breaking both and nothing #
+# said so: it was documented nowhere, and a page written for it would still   #
+# have been invisible without a nav entry.                                   #
+#                                                                            #
+#   1. Every file shipped in src/just_bashit/ is named somewhere in the      #
+#      user-facing docs.                                                     #
+#   2. Every page under docs/ is reachable from zensical.toml's nav.         #
+#                                                                            #
+# docs/changelog.md is excluded as a mention source. It records every script  #
+# ever added, so counting it would pass every script the moment it was        #
+# released — a gate that is green by construction.                           #
+#                                                                            #
+# Failures accumulate: both checks always run and every offender is listed,   #
+# so the set gets fixed once instead of being rediscovered one push at a      #
+# time.                                                                      #
+# ############################################################################
+
+set -uo pipefail
+
+cd "$(dirname "${BASH_SOURCE[0]}")/.." || exit 1
+
+rc=0
+
+# ---------------------------------------------------------------------------
+# 1. Shipped scripts are documented.
+#
+# Anything a user sources or executes counts. The Python launcher shims and
+# the packaged template toml do not: they are packaging plumbing, not
+# something anyone reads about.
+#
+# find rather than `git ls-files`, so a page that exists but is not yet staged
+# still counts — a gate that fails until you `git add` reads as noise. Under
+# pre-commit this is moot anyway, since it stashes unstaged work first and the
+# gate then sees exactly the tree being committed.
+# ---------------------------------------------------------------------------
+undocumented=()
+while IFS= read -r path; do
+	name="${path##*/}"
+	case "${name}" in
+	*.py | *.toml) continue ;;
+	esac
+	if ! grep -rqF -- "${name}" README.md docs \
+		--exclude=changelog.md 2>/dev/null; then
+		undocumented+=("${name}")
+	fi
+done < <(find src/just_bashit -type f)
+
+if ((${#undocumented[@]} > 0)); then
+	echo "ERROR: shipped scripts documented nowhere under docs/:"
+	printf '  %s\n' "${undocumented[@]}"
+	echo "  Add a page (docs/libraries/NAME.md for a sourced library,"
+	echo "  docs/NAME.md for a command) and list it in zensical.toml nav."
+	rc=1
+fi
+
+# ---------------------------------------------------------------------------
+# 2. Pages are reachable.
+#
+# A page absent from nav builds fine and is even served, so nothing fails —
+# it is simply unlinked, which from the outside looks the same as never
+# having been written. Nav paths are relative to docs/, so the prefix is
+# stripped before looking each one up.
+# ---------------------------------------------------------------------------
+unlisted=()
+while IFS= read -r page; do
+	if ! grep -qF -- "\"${page#docs/}\"" zensical.toml; then
+		unlisted+=("${page}")
+	fi
+done < <(find docs -name '*.md')
+
+if ((${#unlisted[@]} > 0)); then
+	echo "ERROR: docs pages missing from zensical.toml nav:"
+	printf '  %s\n' "${unlisted[@]}"
+	rc=1
+fi
+
+if ((rc == 0)); then
+	echo "docs-coverage: every shipped script documented, every page in nav"
+fi
+
+exit "${rc}"
diff --git a/uv.lock b/uv.lock
index d8f27e4..d511e11 100644
--- a/uv.lock
+++ b/uv.lock
@@ -38,9 +38,9 @@ resolution-markers = [
     "python_full_version < '3.10'",
 ]
 dependencies = [
-    { name = "exceptiongroup" },
-    { name = "idna" },
-    { name = "typing-extensions" },
+    { name = "exceptiongroup", marker = "python_full_version < '3.10'" },
+    { name = "idna", marker = "python_full_version < '3.10'" },
+    { name = "typing-extensions", marker = "python_full_version < '3.10'" },
 ]
 sdist = { url = "https://files.pythonhosted.org/packages/96/f0/5eb65b2bb0d09ac6776f2eb54adee6abe8228ea05b20a5ad0e4945de8aac/anyio-4.12.1.tar.gz", hash = "sha256:41cfcc3a4c85d3f05c932da7c26d0201ac36f72abd4435ba90d0464a3ffed703", size = 228685, upload-time = "2026-01-06T11:45:21.246Z" }
 wheels = [
@@ -55,9 +55,9 @@ resolution-markers = [
     "python_full_version >= '3.10'",
 ]
 dependencies = [
-    { name = "exceptiongroup", marker = "python_full_version < '3.11'" },
-    { name = "idna" },
-    { name = "typing-extensions", marker = "python_full_version < '3.13'" },
+    { name = "exceptiongroup", marker = "python_full_version == '3.10.*'" },
+    { name = "idna", marker = "python_full_version >= '3.10'" },
+    { name = "typing-extensions", marker = "python_full_version >= '3.10' and python_full_version < '3.13'" },
 ]
 sdist = { url = "https://files.pythonhosted.org/packages/61/cc/a381afa6efea9f496eff839d4a6a1aed3bfafc7b3ab4b0d1b243a12573dd/anyio-4.14.2.tar.gz", hash = "sha256:cfa139f3ed1a23ee8f88a145ddb5ac7605b8bbfd8592baacd7ce3d8bb4313c7f", size = 260176, upload-time = "2026-07-12T20:29:07.082Z" }
 wheels = [
@@ -153,7 +153,7 @@ resolution-markers = [
     "python_full_version < '3.10'",
 ]
 dependencies = [
-    { name = "colorama", marker = "sys_platform == 'win32'" },
+    { name = "colorama", marker = "python_full_version < '3.10' and sys_platform == 'win32'" },
 ]
 sdist = { url = "https://files.pythonhosted.org/packages/b9/2e/0090cbf739cee7d23781ad4b89a9894a41538e4fcf4c31dcdd705b78eb8b/click-8.1.8.tar.gz", hash = "sha256:ed53c9d8990d83c2a27deae68e4ee337473f6330c040a31d4225c9574d16096a", size = 226593, upload-time = "2024-12-21T18:38:44.339Z" }
 wheels = [
@@ -168,7 +168,7 @@ resolution-markers = [
     "python_full_version >= '3.10'",
 ]
 dependencies = [
-    { name = "colorama", marker = "sys_platform == 'win32'" },
+    { name = "colorama", marker = "python_full_version >= '3.10' and sys_platform == 'win32'" },
 ]
 sdist = { url = "https://files.pythonhosted.org/packages/76/d4/81420972a676e8ffea40450d8c8c92943e7218a78fe9b64359836cc9876b/click-8.4.2.tar.gz", hash = "sha256:9a6cea6e60b17ebe0a44c5cc636d94f09bd66142c1cd7d8b4cd731c4917a15f6", size = 338000, upload-time = "2026-06-24T17:45:15.148Z" }
 wheels = [
@@ -207,7 +207,7 @@ name = "exceptiongroup"
 version = "1.3.1"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
-    { name = "typing-extensions" },
+    { name = "typing-extensions", marker = "python_full_version < '3.13'" },
 ]
 sdist = { url = "https://files.pythonhosted.org/packages/50/79/66800aadf48771f6b62f7eb014e352e5d06856655206165d775e675a02c9/exceptiongroup-1.3.1.tar.gz", hash = "sha256:8b412432c6055b0b7d14c310000ae93352ed6754f70fa8f7c34141f91c4e3219", size = 30371, upload-time = "2025-11-21T23:01:54.787Z" }
 wheels = [
@@ -255,8 +255,8 @@ resolution-markers = [
     "python_full_version < '3.10'",
 ]
 dependencies = [
-    { name = "certifi" },
-    { name = "h11" },
+    { name = "certifi", marker = "python_full_version < '3.10'" },
+    { name = "h11", marker = "python_full_version < '3.10'" },
 ]
 sdist = { url = "https://files.pythonhosted.org/packages/c5/18/e51f5729684acaaab4d1cfca0777ac0f86440c65d2814992442ed5ef02e1/httpcore2-2.0.0.tar.gz", hash = "sha256:403692e0a0e8ea6de90993cdea815b2454d2ff5426e61d2a244846c12506af76", size = 63864, upload-time = "2026-05-12T17:59:22.073Z" }
 wheels = [
@@ -271,8 +271,8 @@ resolution-markers = [
     "python_full_version >= '3.10'",
 ]
 dependencies = [
-    { name = "h11" },
-    { name = "truststore" },
+    { name = "h11", marker = "python_full_version >= '3.10'" },
+    { name = "truststore", marker = "python_full_version >= '3.10'" },
 ]
 sdist = { url = "https://files.pythonhosted.org/packages/39/a8/20ed1ed79cbc2ecdf5301c0968ab7c85547212e2a7bd126ddd2d986e206e/httpcore2-2.9.1.tar.gz", hash = "sha256:4d8acbf8b306f48c9d6046591fd5ba4037d1b1b1000d140fc2c3eab1e9a0c0e2", size = 67089, upload-time = "2026-07-24T09:21:03.867Z" }
 wheels = [
@@ -287,10 +287,10 @@ resolution-markers = [
     "python_full_version < '3.10'",
 ]
 dependencies = [
-    { name = "anyio", version = "4.12.1", source = { registry = "https://pypi.org/simple" } },
-    { name = "certifi" },
-    { name = "httpcore2", version = "2.0.0", source = { registry = "https://pypi.org/simple" } },
-    { name = "idna" },
+    { name = "anyio", version = "4.12.1", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version < '3.10'" },
+    { name = "certifi", marker = "python_full_version < '3.10'" },
+    { name = "httpcore2", version = "2.0.0", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version < '3.10'" },
+    { name = "idna", marker = "python_full_version < '3.10'" },
 ]
 sdist = { url = "https://files.pythonhosted.org/packages/70/95/868b3df4aa6f9cecb42aaf82a55a5a2c8ef40df76d709b812e1553d6a928/httpx2-2.0.0.tar.gz", hash = "sha256:f354249d2a9edce26e08fd2ad2276e98317b5763f673bb0d90f3ce9382cc2aed", size = 79506, upload-time = "2026-05-12T17:59:23.174Z" }
 wheels = [
@@ -305,11 +305,11 @@ resolution-markers = [
     "python_full_version >= '3.10'",
 ]
 dependencies = [
-    { name = "anyio", version = "4.14.2", source = { registry = "https://pypi.org/simple" } },
-    { name = "httpcore2", version = "2.9.1", source = { registry = "https://pypi.org/simple" } },
-    { name = "idna" },
-    { name = "truststore" },
-    { name = "typing-extensions", marker = "python_full_version < '3.13'" },
+    { name = "anyio", version = "4.14.2", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version >= '3.10'" },
+    { name = "httpcore2", version = "2.9.1", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version >= '3.10'" },
+    { name = "idna", marker = "python_full_version >= '3.10'" },
+    { name = "truststore", marker = "python_full_version >= '3.10'" },
+    { name = "typing-extensions", marker = "python_full_version >= '3.10' and python_full_version < '3.13'" },
 ]
 sdist = { url = "https://files.pythonhosted.org/packages/21/14/38128fbafd7e0ed41d874df6c9a653d47c2d111cfe59e2b4ac95161b4abd/httpx2-2.9.1.tar.gz", hash = "sha256:1932a768737e3666291582833da748cc4e563c337cf96706fccc04fa6e58764a", size = 95458, upload-time = "2026-07-24T09:21:04.972Z" }
 wheels = [
@@ -354,7 +354,7 @@ name = "jinja2"
 version = "3.1.6"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
-    { name = "markupsafe" },
+    { name = "markupsafe", marker = "python_full_version >= '3.10'" },
 ]
 sdist = { url = "https://files.pythonhosted.org/packages/df/bf/f7da0350254c0ed7c72f3e33cef02e048281fec7ecec5f032d4aac52226b/jinja2-3.1.6.tar.gz", hash = "sha256:0137fb05990d35f1275a587e9aee6d56da821fc83491a0fb838183be43f66d6d", size = 245115, upload-time = "2025-03-05T20:05:02.478Z" }
 wheels = [
@@ -363,7 +363,7 @@ wheels = [
 
 [[package]]
 name = "just-bashit"
-version = "0.3.2"
+version = "0.4.0"
 source = { editable = "." }
 
 [package.dev-dependencies]
@@ -410,7 +410,7 @@ resolution-markers = [
     "python_full_version < '3.10'",
 ]
 dependencies = [
-    { name = "mdurl" },
+    { name = "mdurl", marker = "python_full_version < '3.10'" },
 ]
 sdist = { url = "https://files.pythonhosted.org/packages/38/71/3b932df36c1a044d397a1f92d1cf91ee0a503d91e470cbd670aa66b07ed0/markdown-it-py-3.0.0.tar.gz", hash = "sha256:e3f60a94fa066dc52ec76661e37c851cb232d92f9886b15cb560aaada2df8feb", size = 74596, upload-time = "2023-06-03T06:41:14.443Z" }
 wheels = [
@@ -425,7 +425,7 @@ resolution-markers = [
     "python_full_version >= '3.10'",
 ]
 dependencies = [
-    { name = "mdurl" },
+    { name = "mdurl", marker = "python_full_version >= '3.10'" },
 ]
 sdist = { url = "https://files.pythonhosted.org/packages/06/ff/7841249c247aa650a76b9ee4bbaeae59370dc8bfd2f6c01f3630c35eb134/markdown_it_py-4.2.0.tar.gz", hash = "sha256:04a21681d6fbb623de53f6f364d352309d4094dd4194040a10fd51833e418d49", size = 82454, upload-time = "2026-05-07T12:08:28.36Z" }
 wheels = [
@@ -533,8 +533,8 @@ name = "mdformat"
 version = "1.0.0"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
-    { name = "markdown-it-py", version = "4.2.0", source = { registry = "https://pypi.org/simple" } },
-    { name = "tomli", marker = "python_full_version < '3.11'" },
+    { name = "markdown-it-py", version = "4.2.0", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version >= '3.10'" },
+    { name = "tomli", marker = "python_full_version == '3.10.*'" },
 ]
 sdist = { url = "https://files.pythonhosted.org/packages/3f/05/32b5e14b192b0a8a309f32232c580aefedd9d06017cb8fe8fce34bec654c/mdformat-1.0.0.tar.gz", hash = "sha256:4954045fcae797c29f86d4ad879e43bb151fa55dbaf74ac6eaeacf1d45bb3928", size = 56953, upload-time = "2025-10-16T12:05:03.695Z" }
 wheels = [
@@ -546,9 +546,9 @@ name = "mdformat-frontmatter"
 version = "2.1.2"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
-    { name = "mdformat" },
-    { name = "mdit-py-plugins" },
-    { name = "ruamel-yaml" },
+    { name = "mdformat", marker = "python_full_version >= '3.10'" },
+    { name = "mdit-py-plugins", marker = "python_full_version >= '3.10'" },
+    { name = "ruamel-yaml", marker = "python_full_version >= '3.10'" },
 ]
 sdist = { url = "https://files.pythonhosted.org/packages/4d/90/ae8a3d20066295367d9048ad480bcde3afe694eb592fec9c35bbdb7d68eb/mdformat_frontmatter-2.1.2.tar.gz", hash = "sha256:9c9c3159c38407f47e567202749c74ce7680017516cd158c82400f015c6a01d1", size = 9425, upload-time = "2026-05-23T05:14:26.324Z" }
 wheels = [
@@ -560,10 +560,10 @@ name = "mdformat-gfm"
 version = "1.0.0"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
-    { name = "markdown-it-py", version = "4.2.0", source = { registry = "https://pypi.org/simple" } },
-    { name = "mdformat" },
-    { name = "mdit-py-plugins" },
-    { name = "wcwidth" },
+    { name = "markdown-it-py", version = "4.2.0", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version >= '3.10'" },
+    { name = "mdformat", marker = "python_full_version >= '3.10'" },
+    { name = "mdit-py-plugins", marker = "python_full_version >= '3.10'" },
+    { name = "wcwidth", marker = "python_full_version >= '3.10'" },
 ]
 sdist = { url = "https://files.pythonhosted.org/packages/56/6f/a626ebb142a290474401b67e2d61e73ce096bf7798ee22dfe6270f924b3f/mdformat_gfm-1.0.0.tar.gz", hash = "sha256:d1d49a409a6acb774ce7635c72d69178df7dce1dc8cdd10e19f78e8e57b72623", size = 10112, upload-time = "2025-10-16T09:12:22.402Z" }
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@@ -575,8 +575,8 @@ name = "mdformat-gfm-alerts"
 version = "2.1.0"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
-    { name = "mdformat" },
-    { name = "mdit-py-plugins" },
+    { name = "mdformat", marker = "python_full_version >= '3.10'" },
+    { name = "mdit-py-plugins", marker = "python_full_version >= '3.10'" },
 ]
 sdist = { url = "https://files.pythonhosted.org/packages/bf/17/98382efef9d4a95fef60f1b5bf9e79a5f62f6698c747d2c99baacdf4cff8/mdformat_gfm_alerts-2.1.0.tar.gz", hash = "sha256:27673500976f08eb9e53cfa359f2a528c1be12052d3f8358996b9c5b1cc0c5c2", size = 9624, upload-time = "2026-07-26T06:46:31.343Z" }
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@@ -588,10 +588,10 @@ name = "mdformat-mkdocs"
 version = "5.3.0"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
-    { name = "mdformat" },
-    { name = "mdformat-gfm" },
-    { name = "mdit-py-plugins" },
-    { name = "more-itertools" },
+    { name = "mdformat", marker = "python_full_version >= '3.10'" },
+    { name = "mdformat-gfm", marker = "python_full_version >= '3.10'" },
+    { name = "mdit-py-plugins", marker = "python_full_version >= '3.10'" },
+    { name = "more-itertools", marker = "python_full_version >= '3.10'" },
 ]
 sdist = { url = "https://files.pythonhosted.org/packages/2e/8c/ca9c13017fcb224e9a0c17c214279eb7273318d1890cd0adc80a3c30e443/mdformat_mkdocs-5.3.0.tar.gz", hash = "sha256:9ae35940cfc1d350c41dda717963c90c669937fbbe3be32412a2b975e4bf891d", size = 33319, upload-time = "2026-08-02T18:38:07.954Z" }
 wheels = [
@@ -603,7 +603,7 @@ name = "mdit-py-plugins"
 version = "0.6.1"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
-    { name = "markdown-it-py", version = "4.2.0", source = { registry = "https://pypi.org/simple" } },
+    { name = "markdown-it-py", version = "4.2.0", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version >= '3.10'" },
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diff --git a/zensical.toml b/zensical.toml
index c9230a7..f3395cc 100644
--- a/zensical.toml
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