Refactor commands into subpackage with unified local/cowork session picker

- Move all commands into commands/ subpackage with pkgutil auto-discovery
- Add shared decorator hierarchy: output_options < interactive_options < local_options
- Unify local and cowork pickers: local now shows both Code and Cowork sessions with source column
- Add --source flag to local (code/cowork/filepath) and all (same semantics)
- Add code and cowork proxy commands that delegate to local with preset source
- Add Cowork session support to all batch command with include_json support
- Make find_cowork_sessions limit optional (default: all)
- Add transcript_label to Session dataclass; batch HTML uses it per session
- Add pytest-cov; add htmlcov/ to .gitignore
- Add tests for source flag filtering, proxy commands, include_json behavior

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: zackman0010

.gitignore

@@ -2,3 +2,5 @@
 __pycache__
 uv.lock
 .playwright-mcp/
+htmlcov/
+.coverage

pyproject.toml

@@ -34,6 +34,7 @@ build-backend = "uv_build"
 [dependency-groups]
 dev = [
     "pytest>=9.0.2",
+    "pytest-cov>=7.1.0",
     "pytest-httpx>=0.35.0",
     "syrupy>=5.0.0",
 ]