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/tools/context/mosaic-context-loader.sh

@@ -0,0 +1,64 @@
+#!/usr/bin/env bash
+# mosaic-context-loader.sh — SessionStart hook for Claude Code
+# Injects mandatory Mosaic config files into agent context at session init.
+# Stdout from this script is added to Claude's context before processing.
+set -euo pipefail
+
+MOSAIC_HOME="${MOSAIC_HOME:-$HOME/.config/mosaic}"
+
+# Mandatory load order (per AGENTS.md contract)
+MANDATORY_FILES=(
+  "$MOSAIC_HOME/SOUL.md"
+  "$MOSAIC_HOME/USER.md"
+  "$MOSAIC_HOME/STANDARDS.md"
+  "$MOSAIC_HOME/AGENTS.md"
+  "$MOSAIC_HOME/TOOLS.md"
+)
+
+# E2E delivery guide (canonical uppercase path)
+E2E_DELIVERY=""
+for candidate in \
+  "$MOSAIC_HOME/guides/E2E-DELIVERY.md"; do
+  if [[ -f "$candidate" ]]; then
+    E2E_DELIVERY="$candidate"
+    break
+  fi
+done
+
+# Runtime-specific reference
+RUNTIME_FILE="$MOSAIC_HOME/runtime/claude/RUNTIME.md"
+
+# Project-local AGENTS.md (cwd at session start)
+PROJECT_AGENTS=""
+if [[ -f "./AGENTS.md" ]]; then
+  PROJECT_AGENTS="./AGENTS.md"
+fi
+
+emit_file() {
+  local filepath="$1"
+  local label="${2:-$(basename "$filepath")}"
+  if [[ -f "$filepath" ]]; then
+    echo "=== MOSAIC: $label ==="
+    cat "$filepath"
+    echo ""
+  fi
+}
+
+echo "=== MOSAIC CONTEXT INJECTION (SessionStart) ==="
+echo ""
+
+for f in "${MANDATORY_FILES[@]}"; do
+  emit_file "$f"
+done
+
+if [[ -n "$E2E_DELIVERY" ]]; then
+  emit_file "$E2E_DELIVERY" "E2E-DELIVERY.md"
+fi
+
+if [[ -n "$PROJECT_AGENTS" ]]; then
+  emit_file "$PROJECT_AGENTS" "Project AGENTS.md ($(pwd))"
+fi
+
+emit_file "$RUNTIME_FILE" "Claude RUNTIME.md"
+
+echo "=== END MOSAIC CONTEXT INJECTION ==="