refactor(curator): point review prompt at existing tools

The LLM review prompt mentioned bespoke `archive_skill` and `pin_skill`
tools that are not registered as model tools. Swap the prompt to rely
on the real surface:

  - skill_manage action=patch  — for patching and consolidation
  - terminal                   — to `mv` skill dirs into .archive/

Also drop `pin` from the model's decision list — pinning is a user
opt-out for `hermes curator pin <skill>`, not something the model
should do autonomously.

Decision list is now: keep / patch / consolidate / archive.

Tests updated: prompt-invariant test now asserts the existing tools
are referenced and that bespoke tool names do NOT appear. New test
prevents `pin` from being re-added as a model decision.

tests/agent/test_curator.py

@@ -359,5 +359,37 @@ def test_curator_review_prompt_has_invariants():
     assert "delete" in CURATOR_REVIEW_PROMPT.lower()
     assert "pinned" in CURATOR_REVIEW_PROMPT.lower()
     # Must mention the decisions the reviewer can make
-    for verb in ("keep", "patch", "archive", "pin"):
+    for verb in ("keep", "patch", "archive", "consolidate"):
         assert verb in CURATOR_REVIEW_PROMPT.lower()
+
+
+def test_curator_review_prompt_points_at_existing_tools_only():
+    """The review prompt must rely on existing tools (skill_manage + terminal)
+    and must NOT reference bespoke curator tools that are not registered
+    model tools."""
+    from agent.curator import CURATOR_REVIEW_PROMPT
+    assert "skill_manage" in CURATOR_REVIEW_PROMPT
+    assert "skills_list" in CURATOR_REVIEW_PROMPT
+    assert "skill_view" in CURATOR_REVIEW_PROMPT
+    assert "terminal" in CURATOR_REVIEW_PROMPT.lower()
+    # These would be nice but aren't actually registered as tools — the
+    # curator uses skill_manage + terminal mv instead.
+    assert "archive_skill" not in CURATOR_REVIEW_PROMPT
+    assert "pin_skill" not in CURATOR_REVIEW_PROMPT
+
+
+def test_curator_does_not_instruct_model_to_pin():
+    """Pinning is a user opt-out, not a model decision. The prompt should
+    not tell the reviewer to pin skills autonomously."""
+    from agent.curator import CURATOR_REVIEW_PROMPT
+    # "pinned" appears in the invariant ("skip pinned skills"), but "pin"
+    # as a decision verb should not.
+    lines = CURATOR_REVIEW_PROMPT.split("\n")
+    decision_block = "\n".join(
+        l for l in lines
+        if l.strip().startswith(("keep", "patch", "archive", "consolidate", "pin "))
+    )
+    # No standalone "pin" action line
+    assert not any(l.strip().startswith("pin ") for l in lines), (
+        f"Found a pin action line in:\n{decision_block}"
+    )