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/detect-platform.sh

@@ -0,0 +1,80 @@
+#!/bin/bash
+# detect-platform.sh - Detect git platform (Gitea or GitHub) for current repo
+# Usage: source detect-platform.sh && detect_platform
+#        or: ./detect-platform.sh (prints platform name)
+
+detect_platform() {
+    local remote_url
+    remote_url=$(git remote get-url origin 2>/dev/null)
+
+    if [[ -z "$remote_url" ]]; then
+        echo "error: not a git repository or no origin remote" >&2
+        return 1
+    fi
+
+    # Check for GitHub
+    if [[ "$remote_url" == *"github.com"* ]]; then
+        PLATFORM="github"
+        export PLATFORM
+        echo "github"
+        return 0
+    fi
+
+    # Check for common Gitea indicators
+    # Gitea URLs typically don't contain github.com, gitlab.com, bitbucket.org
+    if [[ "$remote_url" != *"gitlab.com"* ]] && \
+       [[ "$remote_url" != *"bitbucket.org"* ]]; then
+        # Assume Gitea for self-hosted repos
+        PLATFORM="gitea"
+        export PLATFORM
+        echo "gitea"
+        return 0
+    fi
+
+    PLATFORM="unknown"
+    export PLATFORM
+    echo "unknown"
+    return 1
+}
+
+get_repo_info() {
+    local remote_url
+    remote_url=$(git remote get-url origin 2>/dev/null)
+
+    if [[ -z "$remote_url" ]]; then
+        echo "error: not a git repository or no origin remote" >&2
+        return 1
+    fi
+
+    # Extract owner/repo from URL
+    # Handles: git@host:owner/repo.git, https://host/owner/repo.git, https://host/owner/repo
+    local repo_path
+    if [[ "$remote_url" == git@* ]]; then
+        repo_path="${remote_url#*:}"
+    else
+        repo_path="${remote_url#*://}"
+        repo_path="${repo_path#*/}"
+    fi
+
+    # Remove .git suffix if present
+    repo_path="${repo_path%.git}"
+
+    echo "$repo_path"
+}
+
+get_repo_owner() {
+    local repo_info
+    repo_info=$(get_repo_info)
+    echo "${repo_info%%/*}"
+}
+
+get_repo_name() {
+    local repo_info
+    repo_info=$(get_repo_info)
+    echo "${repo_info##*/}"
+}
+
+# If script is run directly (not sourced), output the platform
+if [[ "${BASH_SOURCE[0]}" == "${0}" ]]; then
+    detect_platform
+fi