fix: use skill activity in curator status

Treat skill views and edits as activity when curator reports and applies lifecycle transitions, so recently loaded or patched skills are not displayed or transitioned as never used.\n\nAdds regression tests for activity derivation, automatic transitions, and CLI status output.

tools/skill_usage.py

@@ -2,7 +2,8 @@
 
 Tracks per-skill usage metadata in a sidecar JSON file (~/.hermes/skills/.usage.json)
 keyed by skill name. Counters are bumped by the existing skill tools (skill_view,
-skill_manage); the curator orchestrator reads them to decide lifecycle transitions.
+skill_manage); the curator orchestrator reads the derived activity timestamp to
+decide lifecycle transitions.
 
 Design notes:
   - Sidecar, not frontmatter. Keeps operational telemetry out of user-authored
@@ -57,6 +58,50 @@ def _now_iso() -> str:
     return datetime.now(timezone.utc).isoformat()
 
 
+def _parse_iso_timestamp(value: Any) -> Optional[datetime]:
+    """Parse an ISO timestamp defensively for activity comparisons."""
+    if not value:
+        return None
+    try:
+        parsed = datetime.fromisoformat(str(value))
+    except (TypeError, ValueError):
+        return None
+    if parsed.tzinfo is None:
+        parsed = parsed.replace(tzinfo=timezone.utc)
+    return parsed
+
+
+def latest_activity_at(record: Dict[str, Any]) -> Optional[str]:
+    """Return the newest actual activity timestamp for a usage record.
+
+    "Activity" means a skill was used, viewed, or patched. Creation time is
+    intentionally excluded so callers can still distinguish never-active skills;
+    lifecycle code can fall back to ``created_at`` as its own anchor.
+    """
+    latest_dt: Optional[datetime] = None
+    latest_raw: Optional[str] = None
+    for key in ("last_used_at", "last_viewed_at", "last_patched_at"):
+        raw = record.get(key)
+        dt = _parse_iso_timestamp(raw)
+        if dt is None:
+            continue
+        if latest_dt is None or dt > latest_dt:
+            latest_dt = dt
+            latest_raw = str(raw)
+    return latest_raw
+
+
+def activity_count(record: Dict[str, Any]) -> int:
+    """Return the total observed activity count across use/view/patch events."""
+    total = 0
+    for key in ("use_count", "view_count", "patch_count"):
+        try:
+            total += int(record.get(key) or 0)
+        except (TypeError, ValueError):
+            continue
+    return total
+
+
 # ---------------------------------------------------------------------------
 # Provenance — which skills are agent-created (and thus eligible for curation)
 # ---------------------------------------------------------------------------
@@ -442,7 +487,7 @@ def _find_skill_dir(skill_name: str) -> Optional[Path]:
 # ---------------------------------------------------------------------------
 
 def agent_created_report() -> List[Dict[str, Any]]:
-    """Return a list of {name, state, pinned, last_used_at, use_count, ...}
+    """Return a list of {name, state, pinned, last_activity_at, ...}
     records for every agent-created skill. Missing usage records are backfilled
     with defaults so callers can always index fields."""
     data = load_usage()
@@ -454,5 +499,8 @@ def agent_created_report() -> List[Dict[str, Any]]:
         base = _empty_record()
         for k, v in base.items():
             rec.setdefault(k, v)
-        rows.append({"name": name, **rec})
+        row = {"name": name, **rec}
+        row["last_activity_at"] = latest_activity_at(row)
+        row["activity_count"] = activity_count(row)
+        rows.append(row)
     return rows