feat(framework): P6 docs + compliance matrix + resident-budget CI (#606)

R9 + R10 of the Constitution alpha (in-repo deliverables):

- framework/CONTRIBUTING.md: layer model, operator-hygiene/PII prohibition,
  dedup rule, resident budget, dual-installer parity rule, adding-a-harness,
  re-contamination rule, harness x gate compliance matrix (hook-parity gap
  marked as tracked-v2), known-limitations (DESIGN §9 residuals), PR checklist.
- check-resident-budget.sh: line-count ceiling over framework-owned resident
  files (CONSTITUTION + AGENTS + each runtime/*/RUNTIME.md), with --self-test;
  replaces the crude inline ci.yml loop. Wired blocking in .woodpecker/ci.yml.

Composer unit test (R9) already runs via pnpm test; verify-sanitized.sh (P1)
already wired. Sanitization + budget + prettier all green.

Remaining for the mission close: aiguide reconcile (separate repo) + the alpha
tag (Lead cuts after full DoD §8 green + all phases merged; P5 #605 pending).

Refs #606, #542

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01EsgTQzV5YUGk1JtCLP4B83

docs/TASKS.md

@@ -48,6 +48,9 @@ Active workstream is **W1 — Federation v1**. Workers should:
 
 ## P5 — Overlay composer + cross-harness (#604) — feat/p5-overlay-composer
 
-- Status: in progress. R7 (compose-contract) + R8 (cross-harness) + R9 (composer test).
+- Status: MERGED to main (#605). R7 (compose-contract) + R8 (cross-harness) + R9 (composer test).
 - `composeContract({harness, mosaicHome})` pure fn + `.local` overlay deltas-by-value; `mosaic compose-contract <harness>` command; AGENTS bare-launch nudge; composer spec (per-tier anchor + Tier-3 byte-equality). Detail: scratchpads/p5-overlay-composer.md.
-- Defer to P6: CONTRIBUTING.md + compliance matrix; line-count CI ceiling; aiguide; alpha tag.
+
+## P6 — Docs, compliance matrix, alpha tag (#606) — feat/p6-docs-compliance-alpha
+
+- Status: in-repo deliverables done (CONTRIBUTING.md + harness×gate compliance matrix + check-resident-budget.sh + CI wiring + ALPHA-DOD.md). Remaining: alpha tag v0.0.39-alpha (Lead, post-merge). aiguide reconcile merged (#8). Detail: scratchpads/p6-docs-compliance-alpha.md.