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/bin/mosaic-migrate-local-skills

@@ -0,0 +1,88 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+MOSAIC_HOME="${MOSAIC_HOME:-$HOME/.config/mosaic}"
+APPLY=0
+
+usage() {
+  cat <<USAGE
+Usage: $(basename "$0") [--apply]
+
+Migrate runtime-local skill directories (e.g. ~/.claude/skills/jarvis) to Mosaic-managed
+skills by replacing local directories with symlinks to ~/.config/mosaic/skills-local.
+
+Default mode is dry-run.
+USAGE
+}
+
+while [[ $# -gt 0 ]]; do
+  case "$1" in
+    --apply)
+      APPLY=1
+      shift
+      ;;
+    -h|--help)
+      usage
+      exit 0
+      ;;
+    *)
+      echo "Unknown argument: $1" >&2
+      usage >&2
+      exit 1
+      ;;
+  esac
+done
+
+skill_roots=(
+  "$HOME/.claude/skills"
+  "$HOME/.codex/skills"
+  "$HOME/.config/opencode/skills"
+  "$HOME/.pi/agent/skills"
+)
+
+if [[ ! -d "$MOSAIC_HOME/skills-local" ]]; then
+  echo "[mosaic-local-skills] Missing local skills dir: $MOSAIC_HOME/skills-local" >&2
+  exit 1
+fi
+
+count=0
+
+while IFS= read -r -d '' local_skill; do
+  name="$(basename "$local_skill")"
+  src="$MOSAIC_HOME/skills-local/$name"
+  [[ -d "$src" ]] || continue
+
+  for root in "${skill_roots[@]}"; do
+    [[ -d "$root" ]] || continue
+    target="$root/$name"
+
+    # Already linked correctly.
+    if [[ -L "$target" ]]; then
+      target_real="$(readlink -f "$target" 2>/dev/null || true)"
+      src_real="$(readlink -f "$src" 2>/dev/null || true)"
+      if [[ -n "$target_real" && -n "$src_real" && "$target_real" == "$src_real" ]]; then
+        continue
+      fi
+    fi
+
+    # Only migrate local directories containing SKILL.md
+    if [[ -d "$target" && -f "$target/SKILL.md" && ! -L "$target" ]]; then
+      count=$((count + 1))
+      if [[ $APPLY -eq 1 ]]; then
+        stamp="$(date +%Y%m%d%H%M%S)"
+        mv "$target" "${target}.mosaic-bak-${stamp}"
+        ln -s "$src" "$target"
+        echo "[mosaic-local-skills] migrated: $target -> $src"
+      else
+        echo "[mosaic-local-skills] would migrate: $target -> $src"
+      fi
+    fi
+  done
+done < <(find "$MOSAIC_HOME/skills-local" -mindepth 1 -maxdepth 1 \( -type d -o -type l \) -print0)
+
+if [[ $APPLY -eq 1 ]]; then
+  echo "[mosaic-local-skills] complete: migrated=$count"
+else
+  echo "[mosaic-local-skills] dry-run: migratable=$count"
+  echo "[mosaic-local-skills] re-run with --apply to migrate"
+fi