Summary

• Derive last_activity_at and activity_count from skill use/view/patch telemetry.
• Use last_activity_at for curator automatic lifecycle transitions, so recently viewed or patched skills are not falsely marked stale.
• Update hermes curator status and curator candidate rendering to show activity instead of only last_used_at.
• Add regression coverage for activity derivation, false stale prevention, and CLI status output.

Test Plan

• /Users/areslee/.hermes/hermes-agent/venv/bin/python -m pytest tests/tools/test_skill_usage.py tests/agent/test_curator_activity.py tests/hermes_cli/test_curator_status.py -q
  • 38 passed
• /Users/areslee/.hermes/hermes-agent/venv/bin/python -m py_compile tools/skill_usage.py agent/curator.py hermes_cli/curator.py
• git diff --check
• Added-lines static scan for secrets/shell/eval/pickle/debugger: no findings
• Independent review agent: passed, no security concerns or logic errors

Refs #17782
Refs #7816

Fixes #17952