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

@@ -45,3 +45,7 @@ Active workstream is **W1 — Federation v1**. Workers should:
 - Status: PR open, awaiting maintainer merge ratification (fleet-governing change).
 - Cut always-injected contract AGENTS+TOOLS+RUNTIME 8,827→4,122 tok (−53%); all 12 hard gates intact.
 - Validation: deterministic gate-checklist PASS; headless A/B thin 7/9 vs monolith 5/9. Detail: scratchpads/contract-thin-core.md.
+
+## 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). Remaining: aiguide reconcile (separate repo), alpha tag (Lead, post-merge). Detail: scratchpads/p6-docs-compliance-alpha.md.