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- tasks/LESSONS.md deleted (empty template; superseded by learnings.md)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/evals.md

@@ -0,0 +1,35 @@
+---
+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
+
+-->