feat(curator): add archive and prune subcommands (#20200)

* fix(curator): protect hub skills by frontmatter name

* test(skill_usage): add mark_agent_created to regression test

The cherry-picked test predates #19618/#19621 which rewrote
list_agent_created_skill_names() to require an explicit
created_by: 'agent' provenance marker. Without mark_agent_created(),
my-skill is excluded from the list and the positive assertion fails.

* feat(curator): add archive and prune subcommands

Adds 'hermes curator archive <skill>' and 'hermes curator prune
[--days N] [--yes] [--dry-run]' alongside the existing status, run,
pause, resume, pin, unpin, restore, backup, rollback verbs.

These are the two genuinely new user-facing verbs requested in #19384.
The other verbs proposed there ('stats' and 'restore') already exist
as 'curator status' and 'curator restore', so no duplicate surface is
added — all skill lifecycle commands live under the single 'hermes
curator' namespace.

- archive: manual archive of an agent-created skill. Refuses pinned
  skills with a hint pointing at 'hermes curator unpin'.
- prune: bulk-archive unpinned skills idle for >= N days (default 90).
  Falls back to created_at when last_activity_at is null so never-used
  skills can still be pruned. --dry-run previews, --yes skips prompt.

Adapted from @elmatadorgh's PR #19454 which placed the same verbs
under 'hermes skills' with a separate hermes_cli/skills_config.py
handler and rich table for stats. The 'stats' and 'restore' parts of
that PR duplicated existing surface, so only archive and prune are
kept, rewritten to match hermes_cli/curator.py's existing plain-text
handler style. Tests rewritten from scratch against the new handlers.

Closes #19384

Co-authored-by: elmatadorgh <coktinbaran5@gmail.com>

---------

Co-authored-by: LeonSGP43 <cine.dreamer.one@gmail.com>
Co-authored-by: elmatadorgh <coktinbaran5@gmail.com>

hermes_cli/curator.py

@@ -245,6 +245,111 @@ def _cmd_restore(args) -> int:
     return 0 if ok else 1
 
 
+def _cmd_archive(args) -> int:
+    """Manually archive an agent-created skill. Refuses if pinned.
+
+    The auto-curator archives stale skills on its own schedule; this verb is
+    for the user who wants to archive *now* without waiting for a run.
+    """
+    from tools import skill_usage
+    if skill_usage.get_record(args.skill).get("pinned"):
+        print(
+            f"curator: '{args.skill}' is pinned — unpin first with "
+            f"`hermes curator unpin {args.skill}`"
+        )
+        return 1
+    ok, msg = skill_usage.archive_skill(args.skill)
+    print(f"curator: {msg}")
+    return 0 if ok else 1
+
+
+def _idle_days(record: dict) -> Optional[int]:
+    """Days since the skill's last activity (view / use / patch).
+
+    Falls back to ``created_at`` so a skill that was authored but never used
+    can still be pruned — otherwise never-touched skills would be immortal.
+    Returns None only when both fields are missing or unparseable.
+    """
+    ts = record.get("last_activity_at") or record.get("created_at")
+    if not ts:
+        return None
+    try:
+        dt = datetime.fromisoformat(str(ts))
+    except (TypeError, ValueError):
+        return None
+    if dt.tzinfo is None:
+        dt = dt.replace(tzinfo=timezone.utc)
+    return max(0, (datetime.now(timezone.utc) - dt).days)
+
+
+def _cmd_prune(args) -> int:
+    """Bulk-archive agent-created skills idle for >= N days.
+
+    Pinned skills are exempt. Already-archived skills are skipped. Default
+    ``--days 90`` matches a conservative read of the curator's own archive
+    threshold; adjust with ``--days``. Use ``--dry-run`` to preview.
+    """
+    from tools import skill_usage
+    days = getattr(args, "days", 90)
+    if days < 1:
+        print(f"curator: --days must be >= 1 (got {days})", file=sys.stderr)
+        return 2
+
+    dry_run = bool(getattr(args, "dry_run", False))
+    skip_confirm = bool(getattr(args, "yes", False))
+
+    candidates = []
+    for r in skill_usage.agent_created_report():
+        if r.get("pinned"):
+            continue
+        if r.get("state") == skill_usage.STATE_ARCHIVED:
+            continue
+        idle = _idle_days(r)
+        if idle is None or idle < days:
+            continue
+        candidates.append((r["name"], idle))
+
+    if not candidates:
+        print(f"curator: nothing to prune (no unpinned skills idle >= {days}d)")
+        return 0
+
+    candidates.sort(key=lambda c: -c[1])
+    print(f"curator: {len(candidates)} skill(s) idle >= {days}d:")
+    for name, idle in candidates:
+        print(f"  {name:40s} idle {idle}d")
+
+    if dry_run:
+        print("\n(dry run — no changes made)")
+        return 0
+
+    if not skip_confirm:
+        try:
+            reply = input(f"\nArchive {len(candidates)} skill(s)? [y/N] ").strip().lower()
+        except (EOFError, KeyboardInterrupt):
+            print("\ncurator: aborted")
+            return 1
+        if reply not in ("y", "yes"):
+            print("curator: aborted")
+            return 1
+
+    archived = 0
+    failures = []
+    for name, _ in candidates:
+        ok, msg = skill_usage.archive_skill(name)
+        if ok:
+            archived += 1
+        else:
+            failures.append((name, msg))
+
+    print(f"\ncurator: archived {archived}/{len(candidates)}")
+    if failures:
+        print("failures:")
+        for name, msg in failures:
+            print(f"  {name}: {msg}")
+        return 1
+    return 0
+
+
 def _cmd_backup(args) -> int:
     """Take a manual snapshot of the skills tree. Same mechanism as the
     automatic pre-run snapshot, just user-initiated."""
@@ -383,6 +488,31 @@ def register_cli(parent: argparse.ArgumentParser) -> None:
     p_restore.add_argument("skill", help="Skill name")
     p_restore.set_defaults(func=_cmd_restore)
 
+    p_archive = subs.add_parser(
+        "archive",
+        help="Manually archive a skill (move to .archive/, excluded from prompt)",
+    )
+    p_archive.add_argument("skill", help="Skill name")
+    p_archive.set_defaults(func=_cmd_archive)
+
+    p_prune = subs.add_parser(
+        "prune",
+        help="Bulk-archive agent-created skills idle for >= N days (default 90)",
+    )
+    p_prune.add_argument(
+        "--days", type=int, default=90,
+        help="Archive skills idle for at least N days (default: 90)",
+    )
+    p_prune.add_argument(
+        "-y", "--yes", action="store_true",
+        help="Skip the confirmation prompt",
+    )
+    p_prune.add_argument(
+        "--dry-run", dest="dry_run", action="store_true",
+        help="Show what would be archived without doing it",
+    )
+    p_prune.set_defaults(func=_cmd_prune)
+
     p_backup = subs.add_parser(
         "backup",
         help="Take a manual tar.gz snapshot of ~/.hermes/skills/ "