refactor: convert project from bash to Python

Replaces cli.sh + lib/*.sh with a claude_bottle/ Python package and a
cli.py entry point. No external dependencies — uses only Python's
stdlib (json, subprocess, getpass, tempfile, argparse, re, etc.).

- claude_bottle/{log,docker,manifest,env_resolve,network,pipelock,
  skills,ssh,cli}.py mirror the previous lib/*.sh modules.
- Tests converted to unittest under tests/test_*.py with a stdlib
  runner at tests/run_tests.py (unit | integration | path).
- .githooks/commit-msg ported to Python; same Conventional Commits rules.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

cli.py

@@ -0,0 +1,25 @@
+#!/usr/bin/env python3
+"""cli.py — manage claude-bottle containers.
+
+usage: cli.py <command> [args...]
+
+Commands:
+  build     build (or rebuild) the claude-bottle Docker image.
+  cleanup   stop and remove all active claude-bottle containers.
+  edit      open an agent in vim for editing.
+  info      print env, skills, and prompt details for a named agent.
+  init      interactively create a new agent and add it to claude-bottle.json.
+  list      list available agents or active containers.
+  start     boot a sandboxed container for a named agent and attach an
+            interactive claude-code session. The container is torn down
+            when the session ends.
+"""
+
+from __future__ import annotations
+
+import sys
+
+from claude_bottle.cli import main
+
+if __name__ == "__main__":
+    sys.exit(main())