feat: integrate framework files into monorepo under packages/mosaic/framework/

Moves all Mosaic framework runtime files from the separate bootstrap repo
into the monorepo as canonical source. The @mosaic/mosaic npm package now
ships the complete framework — bin scripts, runtime configs, tools, and
templates — enabling standalone installation via npm install.

Structure:
  packages/mosaic/framework/
  ├── bin/          28 CLI scripts (mosaic, mosaic-doctor, mosaic-sync-skills, etc.)
  ├── runtime/      Runtime adapters (claude, codex, opencode, pi, mcp)
  ├── tools/        Shell tooling (git, prdy, orchestrator, quality, etc.)
  ├── templates/    Agent and repo templates
  ├── defaults/     Default identity files (AGENTS.md, STANDARDS.md, SOUL.md, etc.)
  ├── install.sh    Legacy bash installer
  └── remote-install.sh  One-liner remote installer

Key files with Pi support and recent fixes:
- bin/mosaic: launch_pi() with skills-local loop
- bin/mosaic-doctor: --fix auto-wiring for all 4 harnesses
- bin/mosaic-sync-skills: Pi as 4th link target, symlink-aware find
- bin/mosaic-link-runtime-assets: Pi settings.json patching
- bin/mosaic-migrate-local-skills: Pi skill roots, symlink find
- runtime/pi/RUNTIME.md + mosaic-extension.ts

Package ships 251 framework files in the npm tarball (278KB compressed).

packages/mosaic/framework/templates/docs/DOCUMENTATION-CHECKLIST.md

@@ -0,0 +1,49 @@
+# Documentation Completion Checklist
+
+Use this checklist for every task that changes code, API contracts, auth, or operations.
+
+## Required Artifacts
+
+- [ ] `docs/PRD.md` or `docs/PRD.json` exists and is current
+- [ ] `docs/USER-GUIDE/` updated as needed
+- [ ] `docs/ADMIN-GUIDE/` updated as needed
+- [ ] `docs/DEVELOPER-GUIDE/` updated as needed
+- [ ] `docs/API/OPENAPI.yaml` (or `.json`) updated for API changes
+- [ ] `docs/API/ENDPOINTS.md` updated for API changes
+- [ ] `docs/SITEMAP.md` updated for navigation changes
+
+## API Coverage
+
+- [ ] All public endpoints are documented
+- [ ] All private/internal endpoints are documented
+- [ ] All API input schemas are documented
+- [ ] All API output schemas are documented
+- [ ] All endpoint auth/permission requirements are documented
+- [ ] Error codes and failure behavior are documented
+
+## Structural Standards (Book/Chapter/Page)
+
+- [ ] `docs/USER-GUIDE/README.md` indexes user chapters/pages
+- [ ] `docs/ADMIN-GUIDE/README.md` indexes admin chapters/pages
+- [ ] `docs/DEVELOPER-GUIDE/README.md` indexes developer chapters/pages
+
+## Docs Root Hygiene
+
+- [ ] `docs/` root is clean and only contains canonical root docs (PRD, TASKS when active, SITEMAP, optional README) plus category directories
+- [ ] Reports are under `docs/reports/<category>/` (not `docs/` root)
+- [ ] Deferred findings are under `docs/reports/deferred/`
+- [ ] Orchestrator learnings are under `docs/tasks/orchestrator-learnings.json`
+- [ ] Release notes are under `docs/releases/`
+- [ ] Archived task snapshots are under `docs/tasks/`
+- [ ] Scratchpads are under `docs/scratchpads/`
+
+## Review Gate
+
+- [ ] Documentation changes are in the same logical change set as code/API changes
+- [ ] Code review verified documentation completeness
+- [ ] Missing docs were treated as blocker findings
+
+## Publishing
+
+- [ ] Publishing target was confirmed with user if unspecified
+- [ ] Canonical source remains in-repo unless user explicitly declares otherwise