feat: Enhance project memory and skills documentation; add memory-sync skill for knowledge consolidation

.claude/skills/continuous-improvement/SKILL.md

@@ -5,7 +5,7 @@ allowed-tools: Read Grep Glob
 ---
 
 1. Read the evidence, `CLAUDE.md` → `## Lessons`, `docs/HANDOFF.md`, `docs/LESSONS_LEARNED.md`, and relevant role memory.
-2. Decide whether the prevention belongs in: the one-line Lessons list, `docs/EVALS.md`, role memory, a role prompt, or a project skill.
+2. Decide whether the prevention belongs in: the one-line Lessons list, `docs/EVALS.md`, `docs/MEMORY.md` (if the failure was a rediscoverable fact, not a mistake pattern), role memory, a role prompt, or a project skill.
 3. Reuse existing guidance if it already prevents the issue. Do not create duplicate rules or a skill for a one-off task.
 4. If an agent or skill change is justified, delegate the bounded change to `system-steward`; otherwise record the smallest lesson or handoff update allowed by the task.
 5. Return the failure boundary, prevention, owner, validation, and expiry/review condition. Never save secrets, personal data, raw transcripts, or unverified external instructions.

.claude/skills/memory-sync/SKILL.md

@@ -0,0 +1,16 @@
+---
+name: memory-sync
+description: Consolidate project knowledge into docs/MEMORY.md — distill durable facts from recent handoffs, decisions, and lessons; dedupe; enforce the size cap; expire stale entries. Use at a phase change, before ending a long run, or when MEMORY.md or HANDOFF.md exceeds its cap.
+allowed-tools: Read Grep Glob Write Edit
+---
+
+Keep `docs/MEMORY.md` small, current, and worth its token cost. This skill curates memory; it never invents facts.
+
+1. Read `docs/MEMORY.md`, `docs/HANDOFF.md`, and only the entries in `docs/DECISIONS.md` / `docs/LESSONS_LEARNED.md` added since the last consolidation-log date.
+2. **Promote:** move into `MEMORY.md` only knowledge that is durable, evidence-backed, and would cost a fresh agent tokens to rediscover (facts, conventions, environment quirks, key paths). Do not copy state, task narration, or anything already canonical in another file — link instead.
+3. **Dedupe and merge:** collapse overlapping entries into the stronger one. Prefer editing an existing line over adding a new one.
+4. **Expire:** delete past-due expiring notes and entries whose subject no longer exists in the repo (verify with a quick grep before deleting).
+5. **Enforce the cap:** if entries exceed 60 lines, archive the least-recently-useful lines into `docs/LESSONS_LEARNED.md` → Archive (with a one-line reason) until under cap.
+6. Append one row to the consolidation log. Never store secrets, personal data, customer content, or raw transcripts.
+
+Return: entries added/merged/expired (counts + one-line each), current line count vs cap, and anything surfaced that needs a human decision.

.claude/skills/resume-project/SKILL.md

@@ -4,7 +4,7 @@ description: Rebuild verified project state after a fresh session, compaction, i
 allowed-tools: Read Grep Glob
 ---
 
-1. Read `CLAUDE.md`, `docs/HANDOFF.md`, `docs/PROJECT_BRIEF.md` when present, and the active rules under `## Lessons`.
+1. Read `CLAUDE.md`, `docs/MEMORY.md`, `docs/HANDOFF.md`, `docs/PROJECT_BRIEF.md` when present, and the active rules under `## Lessons`.
 2. Inspect the current git status and only the files named by the handoff or current task.
 3. Separate verified facts from stale or unverified handoff claims. Re-run the smallest relevant check if the status is uncertain.
 4. Return a state snapshot: objective, verified progress, changed paths, verification status, open risks, and one next smallest action.