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/milestone-create.sh

@@ -0,0 +1,117 @@
+#!/bin/bash
+# milestone-create.sh - Create milestones on Gitea or GitHub
+# Usage: milestone-create.sh -t "Title" [-d "Description"] [--due "YYYY-MM-DD"]
+
+set -e
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+source "$SCRIPT_DIR/detect-platform.sh"
+
+# Default values
+TITLE=""
+DESCRIPTION=""
+DUE_DATE=""
+LIST_ONLY=false
+
+usage() {
+    cat <<EOF
+Usage: $(basename "$0") [OPTIONS]
+
+Create or list milestones on the current repository (Gitea or GitHub).
+
+Versioning Convention:
+    - Features get dedicated milestones
+    - Pre-MVP milestones MUST use 0.0.x and MUST start at 0.0.1
+    - 0.1.0 is reserved for MVP release
+    - After MVP, continue semantic progression (0.1.x, 0.2.x, ...)
+
+Options:
+    -t, --title TITLE       Milestone title/version (e.g., "0.0.1")
+    -d, --desc DESCRIPTION  Milestone description
+    --due DATE              Due date (YYYY-MM-DD format)
+    --list                  List existing milestones
+    -h, --help              Show this help message
+
+Examples:
+    $(basename "$0") --list
+    $(basename "$0") -t "0.0.1" -d "Pre-MVP Foundation Sprint"
+    $(basename "$0") -t "0.1.0" -d "MVP Release" --due "2025-03-01"
+EOF
+    exit 1
+}
+
+# Parse arguments
+while [[ $# -gt 0 ]]; do
+    case $1 in
+        -t|--title)
+            TITLE="$2"
+            shift 2
+            ;;
+        -d|--desc)
+            DESCRIPTION="$2"
+            shift 2
+            ;;
+        --due)
+            DUE_DATE="$2"
+            shift 2
+            ;;
+        --list)
+            LIST_ONLY=true
+            shift
+            ;;
+        -h|--help)
+            usage
+            ;;
+        *)
+            echo "Unknown option: $1" >&2
+            usage
+            ;;
+    esac
+done
+
+PLATFORM=$(detect_platform)
+
+if [[ "$LIST_ONLY" == true ]]; then
+    case "$PLATFORM" in
+        github)
+            gh api repos/:owner/:repo/milestones --jq '.[] | "\(.number)\t\(.title)\t\(.state)\t\(.open_issues)/\(.closed_issues) issues"'
+            ;;
+        gitea)
+            tea milestones list
+            ;;
+        *)
+            echo "Error: Could not detect git platform" >&2
+            exit 1
+            ;;
+    esac
+    exit 0
+fi
+
+if [[ -z "$TITLE" ]]; then
+    echo "Error: Title is required (-t) for creating milestones" >&2
+    usage
+fi
+
+case "$PLATFORM" in
+    github)
+        # GitHub uses the API for milestone creation
+        JSON_PAYLOAD="{\"title\":\"$TITLE\""
+        [[ -n "$DESCRIPTION" ]] && JSON_PAYLOAD="$JSON_PAYLOAD,\"description\":\"$DESCRIPTION\""
+        [[ -n "$DUE_DATE" ]] && JSON_PAYLOAD="$JSON_PAYLOAD,\"due_on\":\"${DUE_DATE}T00:00:00Z\""
+        JSON_PAYLOAD="$JSON_PAYLOAD}"
+
+        gh api repos/:owner/:repo/milestones --method POST --input - <<< "$JSON_PAYLOAD"
+        echo "Milestone '$TITLE' created successfully"
+        ;;
+    gitea)
+        CMD="tea milestones create --title \"$TITLE\""
+        [[ -n "$DESCRIPTION" ]] && CMD="$CMD --description \"$DESCRIPTION\""
+        [[ -n "$DUE_DATE" ]] && CMD="$CMD --deadline \"$DUE_DATE\""
+        eval "$CMD"
+        echo "Milestone '$TITLE' created successfully"
+        ;;
+    *)
+        echo "Error: Could not detect git platform" >&2
+        exit 1
+        ;;
+esac