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/TASKS.md.template

@@ -0,0 +1,17 @@
+# TASKS
+
+Canonical tracking for active work. Keep this file current.
+
+## Rules
+
+1. Update status as work progresses.
+2. Link every non-trivial task to a provider issue (`#123`) or internal ref (`TASKS:T1`) if no provider is available.
+3. Keep one row per active task.
+4. Do not set `status=done` for source-code work until PR is merged, CI/pipeline is terminal green, and linked issue/ref is closed.
+5. If merge/CI/issue closure fails, set `status=blocked` and record the exact failed wrapper command in `notes`.
+
+## Tasks
+
+| id | status | description | issue | repo | branch | depends_on | blocks | agent | started_at | completed_at | estimate | used | notes |
+|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
+| T1 | not-started | Example task description | TASKS:T1 | app | feat/example | | | | | | | | |