docs: migrate project memory governance

.project-docs/60-reflection/reflection-index.md

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+# Reflection Index
+
+Use this index for second-order workflow lessons.
+
+| Date | Reflection | Trigger | Action | Detail |
+|---|---|---|---|---|
+| 2026-08-28 | Shared rolling planning files created repeated size pressure and forced semantic compression. | Root `task_plan.md` repeatedly approached or exceeded its fixed limit. | Replaced the legacy system with task-scoped records plus serialized canonical integration in `.project-docs/`. | [Migration task](../30-worklog/tasks/20260828-migrate-project-docs-6f1a9c2d.md) |
+
+## When To Reflect
+
+Create a reflection only when work reveals a reusable lesson: skipped gates, repeated mistakes, durable debugging patterns, ineffective plans, human corrections, or candidates for new scripts or skills.
+
+Routine task completion belongs in `30-worklog/task-history.md`.

.project-docs/60-reflection/reflection-template.md

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+# Reflection: {short title}
+
+## Trigger
+
+What happened?
+
+## Expected Behavior
+
+What should the agent or workflow have done?
+
+## Actual Behavior
+
+What happened instead?
+
+## Root Cause
+
+Classify the cause:
+
+- Missing trigger
+- Weak gate
+- Stale docs
+- Unclear ownership
+- Missing script
+- Human decision not promoted
+- Agent ignored context
+- Other:
+
+## Evidence
+
+- Commit:
+- Files:
+- Session/thread:
+- Command output:
+- Docs involved:
+
+## Lesson
+
+What should future agents learn?
+
+## Action
+
+Choose one:
+
+- Update docs
+- Update gate
+- Create script
+- Create/update skill
+- Add check/eval
+- Ask human to decide
+- No action
+
+## Promotion
+
+Should this become a rule, ADR, architecture note, task-history entry, skill change, or script?

.project-docs/60-reflection/skill-candidates.md

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+# Skill Candidates
+
+Track repeated workflow lessons that may deserve a reusable skill, script, or stronger gate.
+
+| Date | Candidate | Evidence | Proposed Action | Status |
+|---|---|---|---|---|
+
+## Promotion Rule
+
+If the same reflection pattern appears repeatedly or prevents a serious mistake, propose a skill update, new skill, script, or deterministic check.