chore: regenerate catalog artifacts (CI pipeline)

Ran full CI sequence:
  validate_registry → governance_guardrails → capability_governance_guardrails
  → enforce_capability_sunset → generate_catalog → registry_stats

- catalog/capabilities.json updated with governance metadata for 122 capabilities
- catalog/governance_guardrails.json, capability_governance_guardrails.json refreshed
- catalog/stats.json regenerated

Author: gfernandf