Root cause: ActionEnvelope.to_yaml_value() creates a Mapping from the
facts HashMap without a 'facts:' wrapper key, but rulespec selectors
may include a 'facts.' prefix (e.g. 'facts.feature.done' instead of
'feature.done'). This caused zero facts to be extracted, making all
predicate evaluations fail.
Fix: extract_facts() now tries the selector against the unwrapped
envelope value first, and if empty, retries against a facts-wrapped
version as fallback.
Also:
- Strengthened write_envelope tool description to require top-level
facts: key, file paths for evidence, and allow free-form notes
- Updated system prompt with matching rules
- Added 6 new tests (4 unit, 2 integration)
- Strengthened existing integration test to verify fact count > 0
328eecfcad