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-list.sh

@@ -0,0 +1,93 @@
+#!/bin/bash
+# pr-list.sh - List pull requests on Gitea or GitHub
+# Usage: pr-list.sh [-s state] [-l label] [-a author]
+
+set -e
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+source "$SCRIPT_DIR/detect-platform.sh"
+
+# Default values
+STATE="open"
+LABEL=""
+AUTHOR=""
+LIMIT=30
+
+usage() {
+    cat <<EOF
+Usage: $(basename "$0") [OPTIONS]
+
+List pull requests from the current repository (Gitea or GitHub).
+
+Options:
+    -s, --state STATE       Filter by state: open, closed, merged, all (default: open)
+    -l, --label LABEL       Filter by label
+    -a, --author USER       Filter by author
+    -n, --limit N           Maximum PRs to show (default: 30)
+    -h, --help              Show this help message
+
+Examples:
+    $(basename "$0")                          # List open PRs
+    $(basename "$0") -s all                   # All PRs
+    $(basename "$0") -s merged -a username    # Merged PRs by user
+EOF
+    exit 1
+}
+
+# Parse arguments
+while [[ $# -gt 0 ]]; do
+    case $1 in
+        -s|--state)
+            STATE="$2"
+            shift 2
+            ;;
+        -l|--label)
+            LABEL="$2"
+            shift 2
+            ;;
+        -a|--author)
+            AUTHOR="$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 pr list --state $STATE --limit $LIMIT"
+        [[ -n "$LABEL" ]] && CMD="$CMD --label \"$LABEL\""
+        [[ -n "$AUTHOR" ]] && CMD="$CMD --author \"$AUTHOR\""
+        eval "$CMD"
+        ;;
+    gitea)
+        # tea pr list - note: tea uses 'pulls' subcommand in some versions
+        CMD="tea pr list --state $STATE --limit $LIMIT"
+
+        # tea filtering may be limited
+        if [[ -n "$LABEL" ]]; then
+            echo "Note: Label filtering may require manual review for Gitea" >&2
+        fi
+        if [[ -n "$AUTHOR" ]]; then
+            echo "Note: Author filtering may require manual review for Gitea" >&2
+        fi
+
+        eval "$CMD"
+        ;;
+    *)
+        echo "Error: Could not detect git platform" >&2
+        exit 1
+        ;;
+esac