feat(framework): P3 — extract Constitution (L0) + gut AGENTS dispatcher

Splits the 155-line thin-core AGENTS.md into:
- defaults/CONSTITUTION.md (L0): gates + integrity + escalation + block-vs-done
  + mode + two-axis precedence + hooks-are-the-gate + framework-PR firewall +
  structured-reasoning capability + tier-aware self-load. Capability-verb authored.
- defaults/AGENTS.md gutted to an ~80-line load-order dispatcher + guide table
  (kills the false "already in context, do not re-read" line).
- constitution/LAYER-MODEL.md: source-only governance spec (layers + precedence).

Non-regression wiring (fresh-install functional; upgrade-safety is P4):
- launch.ts injects CONSTITUTION.md before AGENTS.md (tolerant of un-reseeded installs)
- install.sh + file-adapter.ts seed CONSTITUTION.md (+ test fixture updated)

Runtime adapters: capability-verb the sequential-thinking binding; claude/codex/
opencode restate the REQUIRED hard-stop, pi binds to native thinking (gate=false)
— restores the force the adversarial review flagged as weakened.

Gate hardening (dual-engine review): identity denylist now covers examples/
(closes the Codex open-source gap), self-test-first, *.json in scope, ci.yml
typecheck depends on sanitization (fail-fast), L0 line-count ceiling (<=120).

Adversarial gate-preservation review: every original rule traced to L0, the
dispatcher, or a routed guide — nothing lost.

Refs #542, closes #574

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

packages/mosaic/src/config/file-adapter.test.ts

@@ -35,6 +35,7 @@ function makeFixture(): { sourceDir: string; mosaicHome: string; defaultsDir: st
   mkdirSync(mosaicHome, { recursive: true });
 
   // Framework-contract defaults we expect the wizard to seed.
+  writeFileSync(join(defaultsDir, 'CONSTITUTION.md'), '# CONSTITUTION default\n');
   writeFileSync(join(defaultsDir, 'AGENTS.md'), '# AGENTS default\n');
   writeFileSync(join(defaultsDir, 'STANDARDS.md'), '# STANDARDS default\n');
   writeFileSync(join(defaultsDir, 'TOOLS.md'), '# TOOLS default\n');
@@ -62,7 +63,7 @@ describe('FileConfigAdapter.syncFramework — defaults seeding', () => {
     rmSync(join(fixture.sourceDir, '..'), { recursive: true, force: true });
   });
 
-  it('seeds the three framework-contract files on a fresh mosaic home', async () => {
+  it('seeds the four framework-contract files on a fresh mosaic home', async () => {
     const adapter = new FileConfigAdapter(fixture.mosaicHome, fixture.sourceDir);
 
     await adapter.syncFramework('fresh');