diff --git a/AGENTS.md b/AGENTS.md
index 8963896..2475f1f 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -15,3 +15,7 @@ Chromeria's `GLOSSARY.md` is the system glossary; this repository's
 | Agent Observer | `toolboxmd/agent-observer` | [`GLOSSARY.md`](https://github.com/toolboxmd/agent-observer/blob/main/GLOSSARY.md) |
 
 Model Router (`toolboxmd/model-router`) is retired; Chromeria's Prism absorbed it.
+
+## Feature map
+
+When a pull request adds, splits, merges or removes a part of ContextMD, or binds a new Issue to one, update [`docs/map.md`](docs/map.md) in that same pull request.
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0c57491..919836d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,11 @@
 # Changelog
 
+## [0.5.6] - 2026-10-13
+
+### Changed
+
+- docs/map.md maps ContextMD's parts to their Issues and PRs for Chromeria's Map tab (toolboxmd/chromeria#235)
+
 ## [0.5.5] - 2026-10-13
 
 ### Changed
diff --git a/VERSION b/VERSION
index d1d899f..b49b253 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-0.5.5
+0.5.6
diff --git a/docs/map.md b/docs/map.md
new file mode 100644
index 0000000..c382b07
--- /dev/null
+++ b/docs/map.md
@@ -0,0 +1,138 @@
+# ContextMD map
+
+The parts of ContextMD and how they connect. Chromeria's Map tab colours each part
+from GitHub: planned, working, broken or done.
+
+Each part is declared once as `ID["Name"]`. The comment line `%% ID: refs` under it
+names the part's Issues and pull requests; the first ref is the primary ref, which
+decides planned, working or done. `%% ID: context` marks a part this project draws
+but does not track. GitHub ignores these comment lines.
+
+Change this map in the pull request that adds, splits, merges or removes a part.
+
+```mermaid
+flowchart TD
+    S["Session in Chromeria"]
+    %% S: context
+    R["1 Record: Agent Observer sync"]
+    %% R: context
+    C["2 Capture: extract and judge"]
+    %% C: #7 PR #22
+    CJ["Judge calibration, blind rounds"]
+    %% CJ: #8
+    MC["Capture on every machine, scheduled"]
+    %% MC: #42
+    D["3 Cause: route and historical miss join"]
+    %% D: #16
+    W["4a Shape and add-only apply"]
+    %% W: PR #44 #39
+    ST["Great Library store"]
+    %% ST: context
+    KV["4b Key variant proposal"]
+    %% KV: #17
+    SI["4c Serving health check"]
+    %% SI: #40
+    CX["4d Cue miss example to retraining"]
+    %% CX: #16 #4
+    ES["4e Escalation proposal"]
+    %% ES: #17
+    RF["4f Reflection update or remove"]
+    %% RF: #10
+    DI["4g Defect Issues, tracker protocol"]
+    %% DI: #9
+    AS["AgentsMD procedure store"]
+    %% AS: context
+    EK["5 Exact-key serving"]
+    %% EK: #3 #11
+    MK["Must-know rule before its action"]
+    %% MK: toolboxmd/chromeria PR #233 toolboxmd/chromeria#231
+    PK["Path keys on shell commands"]
+    %% PK: toolboxmd/chromeria#234
+    FR["Pointer lifts only on a full read"]
+    %% FR: toolboxmd/chromeria PR #226 toolboxmd/chromeria#225
+    FL["Serving on Codex, Grok, OpenCode"]
+    %% FL: #12
+    GD["Grok deny defects"]
+    %% GD: toolboxmd/chromeria#229 toolboxmd/chromeria#230 toolboxmd/chromeria#228
+    CU["5 Cue lane: scoring service and Chromeria lane"]
+    %% CU: PR #36 #13 toolboxmd/chromeria PR #227
+    GL["Great Library pointer and registration on every machine"]
+    %% GL: #34
+    SR["6 Serve evidence report"]
+    %% SR: PR #38 #15
+    SC["6 Serve card and label prompt"]
+    %% SC: PR #45 #15
+    LJ["6 Labeler judge runs"]
+    %% LJ: #15
+    RP["7 Twice-weekly report"]
+    %% RP: #17
+    CI["Waiting items into Cue entries"]
+    %% CI: #19
+    WF["Cue input window format"]
+    %% WF: #20
+    SP["Per-row proof that a serve was shown"]
+    %% SP: toolboxmd/chromeria#245
+    CK["Command keys fire on runs, not mentions"]
+    %% CK: toolboxmd/chromeria#232
+    RD["Readers called by path; OpenCode reservations"]
+    %% RD: toolboxmd/chromeria#221
+    LF["Library format, flat"]
+    %% LF: #41
+    PT["Pointer-trial retirement"]
+    %% PT: #43
+    NC["Non-code capture"]
+    %% NC: #35
+    GH["GPU serving host recovers on its own"]
+    %% GH: #6
+    RL["Retrieval lane, only if needed"]
+    %% RL: #14
+
+    S --> R --> C --> D
+    CJ -. gates writes .-> C
+    MC -.-> C
+    D -->|needs a home| W --> ST --> EK
+    AS --> EK
+    D -->|key_mismatch| KV --> W
+    D -->|serving or matcher defect| SI
+    D -->|cue_missed| CX --> CU
+    D -->|ignored| ES --> W
+    D -->|wrong| RF --> ST
+    D -->|defect| DI
+    EK --- MK
+    EK --- PK
+    EK --- FR
+    EK --> FL
+    FL --- GD
+    GL --> S
+    EK --> SR
+    CU --> SR
+    SR --> SC --> LJ
+    LJ --> D
+    EK -->|next moment| S
+    CU -->|next moment| S
+    LJ --> RP
+    D --> RP
+    RP --> KV
+    RP --> ES
+    W --> CI --> CU
+    WF -.-> CU
+    GH -.-> CU
+    SP --> SR
+    EK --- CK
+    EK --- RD
+    LF -.-> ST
+    PT --> EK
+    NC -.-> C
+    EK -.-> RL
+```
+
+## Work that is not a part
+
+Every piece of work on the path to the Objective is a part above, except these:
+
+| Work | Why it is not a part |
+| --- | --- |
+| First bake (#39) | A run of one lesson through the whole loop, not a piece of it. It is bound on W. |
+| Great Library flat store | Drawn as ST, a context part: its tracking lives outside this public repository. |
+| "Read in full" wording in AgentsMD (toolboxmd/agentsmd#224, merged) | AgentsMD's own change, inside the AS context part. |
+| Agent Observer event search and lock failures (toolboxmd/agent-observer#70, #71, done) | Agent Observer's own work, inside the R context part. |