[Docs] Specify P1 persisted ownership and add the run-state kernel target architecture

[zoomote]

Related GitHub Issue

Part of #1689 (P1 workstream) and #1790 (run-state kernel epic), both under umbrella #1688. This PR changes documentation only. It closes no issue, because every LIFE-GAP closure needs production evidence from a later PR.

Description

This PR adds or changes eight documents under docs/architecture/:

• task-lifecycle-persisted-ownership-model.md (new): the P1 specification for LIFE-BLK-P1-001, P1-002, P1-012, P1-017, and P1-020, plus the open block LIFE-BLK-P1-039. It specifies two lock-time checks, one per file: an ownership check in the parent file's merge and a generation check in the child file's merge. It rebuilds the field-ownership table from the real writers, and it covers pending-action replay and settlement ([BUG] Infinite subtask creation loop when a pending new_task survives an interruption (Invalid task status transition: interrupted → delegated) #1714, Stop interrupted tasks from replaying rejected subtasks #1726).
• adr/0003-attempt-generation.md (new, Proposed): the persisted attempt generation, the increment when a resumed attempt starts to act, and replay settlement on (actionId, generation).
• adr/0005-pair-write-roll-forward.md (new, Proposed): roll forward a half-finished pair write from the committed child. It includes one behavior change: release a delegated parent whose awaited child no longer links back.
• task-lifecycle-target-architecture.md (new): the run-state kernel design (orthogonal regions, latches, a pure nextRunState) and the maintainer product requirements PR-1 to PR-8.
• task-lifecycle-run-state-kernel-tickets.md (new): the plan for epic [lifecycle-RSK] Run-state kernel #1790 and its 18 sub-issues.
• task-lifecycle-gap-report.md: adds LIFE-GAP-039 (a continued completed task keeps the status completed) and the P1 spec pointers.
• task-lifecycle-remediation-blocks.md: adds LIFE-BLK-P1-039, raises the coverage check from 38 to 39 IDs, and makes LIFE-BLK-P4-010 depend on RSK-10.
• task-lifecycle-model.md: adds the P1 spec pointer.

Why one PR: the target architecture and the P1 spec share LIFE-GAP-039 and the PR-4 decision that it waits on. The two ADRs record decisions that the P1 spec applies. The maintainer chose one review for all of them.

Decisions (maintainer, 2026-09-27):

• Half-finished pair write: roll forward from the committed child, never roll back (ADR-0005). LIFE-BLK-P2-004 owns the implementation and decides whether it uses replayDelegationRepairIntent.
• Replay settlement: settle on (actionId, generation). actionId stays tied to the tool call (ADR-0003).
• Generation increment: at resume, when the resumed attempt starts to act, never on open and never on a completed record (ADR-0003). A completion already in flight when the user stops a child can still land before the next resume. This is accepted.

Reviewer notes:

• Each document names the commit its line numbers match. The P1 spec, the ADRs, and the LIFE-GAP-039 row use 7c291bb08. The target architecture and the ticket plan use fadd66a34.
• The gap report diff is large because prettier widened the register table columns.
• The P1-012 checker models the generation as current versus stale, so repeated stop and resume cycles keep a finite state space. The implementation PR sets and records the depth.
• The immutable-read choice is a recommendation for the implementation PR: clone each record when it enters the cache, then freeze the clone.
• This PR was taken over from Roomote. The three CodeRabbit threads are addressed.

Test Procedure

• npx prettier --check docs/architecture/task-lifecycle-*.md docs/architecture/adr/*.md passes.
• The two mechanical coverage checks in task-lifecycle-remediation-blocks.md pass for 39 IDs.
• No code changes.

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📝 Summary

Summary by CodeRabbit

• Documentation
  • Added a formal specification for persisted task ownership and generation behavior.
  • Documented lifecycle field ownership, stale-cache convergence scenarios, immutable read expectations, and attempt-generation semantics.
  • Added cross-references between lifecycle architecture, gap reports, and remediation blocks.
  • Updated witness and reproducer references for five lifecycle gaps.
  • Clarified that these documentation changes do not alter production behavior or close existing gaps.

Walkthrough

The PR adds a persisted ownership and generation model for five lifecycle gaps. It documents ownership boundaries, generation semantics, immutable reads, and cache convergence histories. Existing lifecycle reports now link to the new specification and its remediation blocks. No production behavior changes.

Changes

Lifecycle P1 documentation

Layer / File(s)	Summary
Persisted ownership and generation specification docs/architecture/task-lifecycle-persisted-ownership-model.md	Adds specifications for awaited-child revalidation, lifecycle-owned fields, attempt generations, immutable store reads, and stale-cache convergence. It also defines deferred production evidence and checker boundaries.
Architecture traceability links docs/architecture/task-lifecycle-gap-report.md, docs/architecture/task-lifecycle-model.md, docs/architecture/task-lifecycle-remediation-blocks.md	Links the five gap entries and P1 remediation blocks to the persisted ownership and generation model.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~5 minutes

Change: Other

Suggested reviewers: taltas

Merge Risk: 🟡 Moderate · up to fdb2e

The PR’s architecture specification contains material contradictions that could misdirect later lifecycle implementation and validation. Correct these before merging the model.

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Pre-merge checks failed

Please resolve all errors before merging. Addressing warnings is optional.

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❌ Failed checks (1 error)

Check name	Status	Explanation	Resolution
Linked Issues check	❌ Error	The specification addresses all five linked gaps in #1689 and defines the required behavior. However, it does not implement the coding requirements. It adds no persisted ownership guard, lifecycle-fie…	Implement the #1689 runtime changes and deterministic automated tests: lock-time awaited-child ownership revalidation; lifecycle-owned field protection and monotonic detachment; persisted attempt generation with reducer and store rejection;…

✅ Passed checks (7 passed)

Check name	Status	Explanation
Out of Scope Changes check	✅ Passed	The changes stay within #1689. They add the P1 architecture specification, update the gap report and lifecycle model cross-references, and update the remediation-block register. These documents define…
Regression Evidence	✅ Passed	The review-scoped diff changes only four Markdown files under docs/architecture/. The raw change records show no source, schema, test, workflow, or UI files, and the patch adds only documentation, c…
Security Boundaries	✅ Passed	PASS. The reviewed range changes only four 100644 Markdown files under docs/architecture/. The patch adds or updates documentation, tables, and cross-references; it does not change production code, …
Persistence Integrity	✅ Passed	PASS: The review-scoped diff changes only four Markdown files under docs/architecture/. It changes no persistence implementation, schema, test, or executable path. Therefore, it introduces no change…
Lifecycle Resource Cleanup	✅ Passed	PASS. The reviewed range changes only four docs/architecture/*.md files. The diff contains no runtime source, test, configuration, or executable-file changes. The new lifecycle document and cross-re…
Title check	✅ Passed	The title clearly identifies the documentation scope and the two primary changes: persisted ownership specification and run-state kernel target architecture.
Description check	✅ Passed	The description links the PR to approved issues, explains the documentation changes and design decisions, and provides validation steps. It omits several template sections, including the checklist and…

Full details: Linked Issues check

Explanation

The specification addresses all five linked gaps in #1689 and defines the required behavior. However, it does not implement the coding requirements. It adds no persisted ownership guard, lifecycle-field enforcement, attempt-generation field or checks, immutable store reads, or convergence behavior. It adds no closure tests for these requirements. The document explicitly defers these changes to later PRs, while #1689 requires closure only after its gap criteria pass.

Resolution

Implement the #1689 runtime changes and deterministic automated tests: lock-time awaited-child ownership revalidation; lifecycle-owned field protection and monotonic detachment; persisted attempt generation with reducer and store rejection; immutable TaskHistoryStore reads; and watcher/reconciliation convergence and fault-injection coverage. Then verify all five gap closure criteria.

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Codecov Report

✅ All modified and coverable lines are covered by tests.

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Review status

This PR was opened by an automated account. A human maintainer must verify the change intent, provenance, and validation before merging.

Current step: Address maintainer or CODEOWNER feedback, push an update, then re-request review from the blocking maintainer.

Review-state labels are managed by this workflow; do not edit them manually. community-approved is managed the same way — do not add or remove it manually. It signals a fresh community code approval for the current head as an advisory priority only; maintainer review is still required.

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Actionable comments posted: 3

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• 🪄 Fix CodeRabbit comments on this PR

🤖 Prompt to fix review comments

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Inline comments:
In `@docs/architecture/task-lifecycle-persisted-ownership-model.md`:
- Line 111: Update the bounded-property statement near mergeHistoryDelta to
describe conflict resolution per field rather than asserting blanket
last-writer-wins. Preserve status-transition legality and childIds union
semantics, explicitly limit last-writer-wins to fields that use it, and add the
corresponding exceptions to the convergence property and tests.
- Line 79: Update scripts/check-task-lifecycle.ts so stale-generation completion
is modeled as a reachable rejected action after resume, rather than being
omitted because complete(child, g0) is disabled; alternatively add an explicit
offerComplete(child, g) transition that reaches the rejection behavior. Ensure
the stale-generation-completion-rejected landmark becomes reachable while valid
current-generation completion remains unchanged.
- Line 119: Update the reconcile() documentation to remove the claim that the
mtime skip is exact, and qualify it as best-effort because identical mtimeMs
values can leave cached payloads stale after an atomic replacement. Add
collision coverage for this case, or change reconciliation to use a stronger
change marker or force a read instead of relying solely on taskFileMtimes.

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• docs/architecture/task-lifecycle-gap-report.md
• docs/architecture/task-lifecycle-model.md
• docs/architecture/task-lifecycle-persisted-ownership-model.md
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Files:

• docs/architecture/task-lifecycle-model.md
• docs/architecture/task-lifecycle-gap-report.md
• docs/architecture/task-lifecycle-remediation-blocks.md
• docs/architecture/task-lifecycle-persisted-ownership-model.md

🪛 LanguageTool

docs/architecture/task-lifecycle-gap-report.md

[grammar] ~199-~199: Use a hyphen to join words.
Context: ... | Single typed event owner. ...

(QB_NEW_EN_HYPHEN)

🔇 Additional comments (4)

docs/architecture/task-lifecycle-persisted-ownership-model.md (1)

70-75: 🗄️ Data Integrity & Integration

The downgrade-writer loss claim is refuted. TaskHistoryStore writes deltas by spreading them over the current disk object, so unknown fields are preserved. Its downgrade write-through updates globalState; it does not rewrite history_item.json. Existing-file migration also skips the write. No inspected path rewrites history_item.json from only known fields.

docs/architecture/task-lifecycle-model.md (1)

78-79: LGTM!

Also applies to: 148-148

docs/architecture/task-lifecycle-remediation-blocks.md (1)

32-33: LGTM!

docs/architecture/task-lifecycle-gap-report.md (1)

171-210: LGTM!

[edelauna]

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[edelauna]

Merging will update docs as we go if needed

extended scope intentionally