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/git/issue-list.sh

@@ -0,0 +1,96 @@
+#!/bin/bash
+# issue-list.sh - List issues on Gitea or GitHub
+# Usage: issue-list.sh [-s state] [-l label] [-m milestone] [-a assignee]
+
+set -e
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+source "$SCRIPT_DIR/detect-platform.sh"
+
+# Default values
+STATE="open"
+LABEL=""
+MILESTONE=""
+ASSIGNEE=""
+LIMIT=100
+
+usage() {
+    cat <<EOF
+Usage: $(basename "$0") [OPTIONS]
+
+List issues from the current repository (Gitea or GitHub).
+
+Options:
+    -s, --state STATE       Filter by state: open, closed, all (default: open)
+    -l, --label LABEL       Filter by label
+    -m, --milestone NAME    Filter by milestone name
+    -a, --assignee USER     Filter by assignee
+    -n, --limit N           Maximum issues to show (default: 100)
+    -h, --help              Show this help message
+
+Examples:
+    $(basename "$0")                          # List open issues
+    $(basename "$0") -s all -l bug            # All issues with 'bug' label
+    $(basename "$0") -m "0.2.0"               # Issues in milestone 0.2.0
+EOF
+    exit 1
+}
+
+# Parse arguments
+while [[ $# -gt 0 ]]; do
+    case $1 in
+        -s|--state)
+            STATE="$2"
+            shift 2
+            ;;
+        -l|--label)
+            LABEL="$2"
+            shift 2
+            ;;
+        -m|--milestone)
+            MILESTONE="$2"
+            shift 2
+            ;;
+        -a|--assignee)
+            ASSIGNEE="$2"
+            shift 2
+            ;;
+        -n|--limit)
+            LIMIT="$2"
+            shift 2
+            ;;
+        -h|--help)
+            usage
+            ;;
+        *)
+            echo "Unknown option: $1" >&2
+            usage
+            ;;
+    esac
+done
+
+PLATFORM=$(detect_platform)
+
+case "$PLATFORM" in
+    github)
+        CMD="gh issue list --state $STATE --limit $LIMIT"
+        [[ -n "$LABEL" ]] && CMD="$CMD --label \"$LABEL\""
+        [[ -n "$MILESTONE" ]] && CMD="$CMD --milestone \"$MILESTONE\""
+        [[ -n "$ASSIGNEE" ]] && CMD="$CMD --assignee \"$ASSIGNEE\""
+        eval "$CMD"
+        ;;
+    gitea)
+        CMD="tea issues list --state $STATE --limit $LIMIT"
+        [[ -n "$LABEL" ]] && CMD="$CMD --labels \"$LABEL\""
+        [[ -n "$MILESTONE" ]] && CMD="$CMD --milestones \"$MILESTONE\""
+        # Note: tea may not support assignee filter directly
+        eval "$CMD"
+        if [[ -n "$ASSIGNEE" ]]; then
+            echo "Note: Assignee filtering may require manual review for Gitea" >&2
+        fi
+        ;;
+    *)
+        echo "Error: Could not detect git platform" >&2
+        exit 1
+        ;;
+esac