feat: complete framework migration — PowerShell, adapters, guides, profiles, tests

Completes the bootstrap repo migration with remaining files:
- PowerShell scripts (.ps1) for Windows support (bin/ + tools/)
- Runtime adapters (claude, codex, generic, pi)
- Guides (17 .md files) and profiles (domains, tech-stacks, workflows)
- Wizard test suite (6 test files from bootstrap tests/)
- Memory placeholder, audit history

Bootstrap repo (mosaic/bootstrap) is now fully superseded:
- All 335 files accounted for
- 5 build config files (package.json, tsconfig, etc.) not needed —
  monorepo has its own at packages/mosaic/
- skills-local/ superseded by monorepo skills/ with mosaic-* naming
- src/ already lives at packages/mosaic/src/

packages/mosaic/framework/adapters/pi.md

@@ -0,0 +1,36 @@
+# Pi Adapter
+
+Use this adapter when running Pi sessions via `mosaic pi`.
+
+## Required Context
+
+1. `~/.config/mosaic/STANDARDS.md`
+2. `<repo>/AGENTS.md`
+
+## Integration
+
+Pi is the native Mosaic agent runtime. The `mosaic pi` launcher:
+
+1. Injects the full runtime contract via `--append-system-prompt`
+2. Loads Mosaic skills via `--skill` flags
+3. Loads the Mosaic extension via `--extension` for lifecycle hooks
+4. Detects active missions and injects initial prompts
+
+## Capabilities vs Other Runtimes
+
+- No permission restrictions (no yolo flag needed)
+- Native thinking levels replace sequential-thinking MCP
+- Native skill discovery compatible with Mosaic SKILL.md format
+- Native extension system for lifecycle hooks (TypeScript, not bash shims)
+- Native session persistence and resume
+- Model-agnostic (Anthropic, OpenAI, Google, Ollama, custom providers)
+
+## Command Wrapper
+
+```bash
+mosaic pi                    # Interactive session
+mosaic pi "Fix the auth bug" # With initial prompt
+mosaic yolo pi               # Identical to mosaic pi
+mosaic coord --pi run        # Coordinator-driven session
+mosaic prdy --pi init        # PRD creation via Pi
+```