chore: tidy gitignore, Dockerfile indent, unused import

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

.gitignore

@@ -4,3 +4,14 @@ Thumbs.db
 # mcp-server (TypeScript)
 mcp-server/node_modules/
 mcp-server/dist/
+
+# Python
+__pycache__/
+*.py[cod]
+*$py.class
+*.egg-info/
+.venv/
+venv/
+.pytest_cache/
+.mypy_cache/
+.ruff_cache/

claude_bottle/cli.py

@@ -24,7 +24,6 @@ from . import ssh as ssh_mod
 from .env_resolve import env_resolve
 from .log import Die, die, info, warn
 from .manifest import (
-    Manifest,
     manifest_agent_bottle,
     manifest_env_names,
     manifest_prompt,