feat: Add @mosaic/cli-tools package for git operations

New package providing CLI tools that work with both Gitea and GitHub:

Commands:
- mosaic-issue-{create,list,view,assign,edit,close,reopen,comment}
- mosaic-pr-{create,list,view,merge,review,close}
- mosaic-milestone-{create,list,close}

Features:
- Auto-detects platform (Gitea vs GitHub) from git remote
- Unified interface regardless of platform
- Available via `pnpm exec mosaic-*` in monorepo context

Updated docs/claude/orchestrator.md:
- Added CLI Tools section with usage examples
- Updated issue creation to use package commands

This makes Mosaic Stack fully self-contained for orchestration tooling.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

packages/cli-tools/bin/pr-merge.sh

@@ -0,0 +1,110 @@
+#!/bin/bash
+# pr-merge.sh - Merge pull requests on Gitea or GitHub
+# Usage: pr-merge.sh -n PR_NUMBER [-m method] [-d]
+
+set -e
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+source "$SCRIPT_DIR/detect-platform.sh"
+
+# Default values
+PR_NUMBER=""
+MERGE_METHOD="merge"  # merge, squash, rebase
+DELETE_BRANCH=false
+
+usage() {
+    cat <<EOF
+Usage: $(basename "$0") [OPTIONS]
+
+Merge a pull request on the current repository (Gitea or GitHub).
+
+Options:
+    -n, --number NUMBER     PR number to merge (required)
+    -m, --method METHOD     Merge method: merge, squash, rebase (default: merge)
+    -d, --delete-branch     Delete the head branch after merge
+    -h, --help              Show this help message
+
+Examples:
+    $(basename "$0") -n 42                    # Merge PR #42
+    $(basename "$0") -n 42 -m squash          # Squash merge
+    $(basename "$0") -n 42 -m rebase -d       # Rebase and delete branch
+EOF
+    exit 1
+}
+
+# Parse arguments
+while [[ $# -gt 0 ]]; do
+    case $1 in
+        -n|--number)
+            PR_NUMBER="$2"
+            shift 2
+            ;;
+        -m|--method)
+            MERGE_METHOD="$2"
+            shift 2
+            ;;
+        -d|--delete-branch)
+            DELETE_BRANCH=true
+            shift
+            ;;
+        -h|--help)
+            usage
+            ;;
+        *)
+            echo "Unknown option: $1" >&2
+            usage
+            ;;
+    esac
+done
+
+if [[ -z "$PR_NUMBER" ]]; then
+    echo "Error: PR number is required (-n)" >&2
+    usage
+fi
+
+PLATFORM=$(detect_platform)
+
+case "$PLATFORM" in
+    github)
+        CMD="gh pr merge $PR_NUMBER"
+        case "$MERGE_METHOD" in
+            merge)   CMD="$CMD --merge" ;;
+            squash)  CMD="$CMD --squash" ;;
+            rebase)  CMD="$CMD --rebase" ;;
+            *)
+                echo "Error: Invalid merge method '$MERGE_METHOD'" >&2
+                exit 1
+                ;;
+        esac
+        [[ "$DELETE_BRANCH" == true ]] && CMD="$CMD --delete-branch"
+        eval "$CMD"
+        ;;
+    gitea)
+        # tea pr merge syntax
+        CMD="tea pr merge $PR_NUMBER"
+
+        # tea merge style flags
+        case "$MERGE_METHOD" in
+            merge)   CMD="$CMD --style merge" ;;
+            squash)  CMD="$CMD --style squash" ;;
+            rebase)  CMD="$CMD --style rebase" ;;
+            *)
+                echo "Error: Invalid merge method '$MERGE_METHOD'" >&2
+                exit 1
+                ;;
+        esac
+
+        # Delete branch after merge if requested
+        if [[ "$DELETE_BRANCH" == true ]]; then
+            echo "Note: Branch deletion after merge may need to be done separately with tea" >&2
+        fi
+
+        eval "$CMD"
+        ;;
+    *)
+        echo "Error: Could not detect git platform" >&2
+        exit 1
+        ;;
+esac
+
+echo "PR #$PR_NUMBER merged successfully"