feat: add 'hermes claw migrate' command + migration docs
- Add hermes_cli/claw.py with full CLI migration handler:
- hermes claw migrate (interactive migration with confirmation)
- --dry-run, --preset, --overwrite, --skill-conflict flags
- --source for custom OpenClaw path
- --yes to skip confirmation
- Clean formatted output matching setup wizard style
- Fix Python 3.11+ @dataclass compatibility bug in dynamic module loading:
- Register module in sys.modules before exec_module()
- Fixes both setup.py (PR #981) and new claw.py
- Add 16 tests in tests/hermes_cli/test_claw.py covering:
- Script discovery (project root, installed, missing)
- Command routing
- Dry-run, execute, cancellation, error handling
- Preset/secrets behavior, report formatting
- Documentation updates:
- README.md: Add 'hermes claw migrate' to Getting Started, new Migration section
- docs/migration/openclaw.md: Full migration guide with all options
- SKILL.md: Add CLI Command section at top of openclaw-migration skill
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