feat(memory): introduce .claude/{tasks,memory,audits}/ governance layout

Move tasks/ into .claude/tasks/ and create .claude/memory/ with 5
persistent registries (decisions/learnings/blockers/journal/evals) plus
.claude/audits/ for audit reports. Also seed templates/memory/ for
onboarder to copy into user projects.

- tasks/TODO.md, tasks/rtk-upstream-issue.md → .claude/tasks/
- tasks/LESSONS.md deleted (empty template; superseded by learnings.md)
- .claude/memory/: 5 append-only registries with YAML schema + seed entries
- templates/memory/: 5 empty-index templates for new projects

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

templates/memory/blockers.md

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+---
+type: blockers_registry
+entry_prefix: BLK
+schema:
+  id: BLK-XXX
+  date: YYYY-MM-DD
+  friction: string (what was blocked)
+  real_cause: string (root cause, not symptom)
+  solution: string (workaround or fix)
+  status: [open | resolved | upstream]
+rules:
+  - Open a blocker as soon as friction > 15 min wasted. Close it with a real cause, not "moved on".
+  - Link to upstream issue / PR / commit when applicable.
+  - If cause is a bug in a dependency, set status upstream with a pointer to the tracker.
+---
+
+# Blockers registry (BLK)
+
+## Index
+
+| ID | Date | Friction | Status |
+|----|------|---------|--------|
+
+<!-- Append entries below. Template:
+
+## BLK-XXX - <friction>
+
+- **Date** : YYYY-MM-DD
+- **Friction** : <ce qui était bloqué>
+- **Cause réelle** : <cause racine>
+- **Solution** : <workaround ou fix>
+- **Statut** : open | resolved | upstream
+
+-->

templates/memory/decisions.md

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+---
+type: decisions_registry
+entry_prefix: BDR
+schema:
+  id: BDR-XXX
+  date: YYYY-MM-DD
+  title: string (<= 80 chars)
+  decision: string (what was chosen)
+  why: string (motivation, context)
+  alternatives: list of strings (what was rejected + why)
+  status: [proposed | accepted | deprecated | superseded]
+  supersedes: BDR-XXX (optional)
+rules:
+  - Append-only. Never rewrite past entries - add a new one with status superseded if needed.
+  - One entry per non-trivial choice. Trivial = reversible in under 10 min with no cross-file impact.
+  - Capture why more carefully than what - the what rots, the why lasts.
+---
+
+# Decisions registry (BDR)
+
+## Index
+
+| ID | Date | Title | Status |
+|----|------|-------|--------|
+
+<!-- Append entries below. Template:
+
+## BDR-XXX - <titre>
+
+- **Date** : YYYY-MM-DD
+- **Statut** : proposed | accepted | deprecated | superseded
+- **Décision** : <ce qui a été choisi>
+- **Pourquoi** : <motivation>
+- **Alternatives rejetées** :
+  - Option A - <raison du rejet>
+  - Option B - <raison du rejet>
+- **Référence** : <commit / PR / fichier>
+
+-->

templates/memory/evals.md

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+---
+type: evals_registry
+entry_prefix: EVAL
+schema:
+  id: EVAL-XXX
+  date: YYYY-MM-DD
+  output: string (what was produced)
+  method: string (how it was evaluated - manual read, test, benchmark, user feedback)
+  anomalies: list of strings (what was wrong, missing, surprising)
+  action: [keep | correct | deprecate]
+rules:
+  - Log an eval whenever you validate the quality of something Claude produced (report, audit, plan, generated code).
+  - Action keep - the output is fit for purpose as-is.
+  - Action correct - needs revision; capture what.
+  - Action deprecate - the approach itself is flawed; link to the decision that replaces it.
+---
+
+# Evals registry (EVAL)
+
+## Index
+
+| ID | Date | Output | Action |
+|----|------|--------|--------|
+
+<!-- Append entries below. Template:
+
+## EVAL-XXX - <output>
+
+- **Date** : YYYY-MM-DD
+- **Output** : <ce qui a été produit>
+- **Méthode** : <comment cela a été évalué>
+- **Anomalies** : <ce qui est faux, manquant, surprenant>
+- **Action** : keep | correct | deprecate
+
+-->

templates/memory/journal.md

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+---
+type: journal
+schema:
+  entry: one date heading per working session
+  body: 3-5 lines max - what was done, decided, blocked
+rules:
+  - One heading per date (YYYY-MM-DD), not per session.
+  - Append at the end. Never edit past entries.
+  - Keep it terse. Details belong in decisions/learnings/blockers - this is a timeline only.
+---
+
+# Journal
+
+<!-- Append new date-heading entries below. Template:
+
+## YYYY-MM-DD
+
+- <ligne 1>
+- <ligne 2>
+- <ligne 3-5 max>
+
+-->

templates/memory/learnings.md

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+---
+type: learnings_registry
+entry_prefix: LRN
+schema:
+  id: LRN-XXX
+  date: YYYY-MM-DD
+  pattern: string (what was observed, abstracted)
+  context: string (where/when it happened - concrete)
+  future_application: string (when to recall this)
+rules:
+  - Capture learnings that apply beyond the current task.
+  - Abstract from the incident - the pattern is what is reusable, not the one-shot fact.
+  - Link to source (commit, file, PR) when possible.
+---
+
+# Learnings registry (LRN)
+
+## Index
+
+| ID | Date | Pattern | Applies to |
+|----|------|---------|------------|
+
+<!-- Append entries below. Template:
+
+## LRN-XXX - <pattern abstrait>
+
+- **Date** : YYYY-MM-DD
+- **Pattern** : <ce qui a été observé, formulé de manière réutilisable>
+- **Contexte** : <où et quand, concret>
+- **Application future** : <quand se rappeler de ceci>
+
+-->