feat(cron): honor hermes tools config for the cron platform (#14798)

Cron now resolves its toolset from the same per-platform config the
gateway uses — `_get_platform_tools(cfg, 'cron')` — instead of blindly
loading every default toolset.  Existing cron jobs without a per-job
override automatically lose `moa`, `homeassistant`, and `rl` (the
`_DEFAULT_OFF_TOOLSETS` set), which stops the "surprise $4.63
mixture_of_agents run" class of bug (Norbert, Discord).

Precedence inside `run_job`:
  1. per-job `enabled_toolsets` (PR #14767 / #6130) — wins if set
  2. `_get_platform_tools(cfg, 'cron')` — new, the blanket gate
  3. `None` fallback (legacy) — only on resolver exception

Changes:
- hermes_cli/platforms.py: register 'cron' with default_toolset
  'hermes-cron'
- toolsets.py: add 'hermes-cron' toolset (mirrors 'hermes-cli';
  `_get_platform_tools` then filters via `_DEFAULT_OFF_TOOLSETS`)
- cron/scheduler.py: add `_resolve_cron_enabled_toolsets(job, cfg)`,
  call it at the `AIAgent(...)` kwargs site
- tests/cron/test_scheduler.py: replace the 'None when not set' test
  (outdated contract) with an invariant ('moa not in default cron
  toolset') + new per-job-wins precedence test
- tests/hermes_cli/test_tools_config.py: mark 'cron' as non-messaging
  in the gateway-toolset-coverage test

tests/cron/test_scheduler.py

@@ -710,7 +710,15 @@ class TestRunJobSessionPersistence:
         kwargs = mock_agent_cls.call_args.kwargs
         assert kwargs["enabled_toolsets"] == ["web", "terminal", "file"]
 
-    def test_run_job_enabled_toolsets_none_when_not_set(self, tmp_path):
+    def test_run_job_enabled_toolsets_resolves_from_platform_config_when_not_set(self, tmp_path):
+        """When a job has no explicit enabled_toolsets, the scheduler now
+        resolves them from ``hermes tools`` platform config for ``cron``
+        (PR #14xxx — blanket fix for Norbert's surprise ``moa`` run).
+
+        The legacy "pass None → AIAgent loads full default" path is still
+        reachable, but only when ``_get_platform_tools`` raises (safety net
+        for any unexpected config shape).
+        """
         job = {
             "id": "no-toolset-job",
             "name": "test",
@@ -725,7 +733,39 @@ class TestRunJobSessionPersistence:
             run_job(job)
 
         kwargs = mock_agent_cls.call_args.kwargs
-        assert kwargs["enabled_toolsets"] is None
+        # Resolution happened — not None, is a list.
+        assert isinstance(kwargs["enabled_toolsets"], list)
+        # The cron default is _HERMES_CORE_TOOLS with _DEFAULT_OFF_TOOLSETS
+        # (``moa``, ``homeassistant``, ``rl``) removed. The most important
+        # invariant: ``moa`` is NOT in the default cron toolset, so a cron
+        # run cannot accidentally spin up frontier models.
+        assert "moa" not in kwargs["enabled_toolsets"]
+
+    def test_run_job_per_job_toolsets_win_over_platform_config(self, tmp_path):
+        """Per-job enabled_toolsets (via cronjob tool) always take precedence
+        over the platform-level ``hermes tools`` config."""
+        job = {
+            "id": "override-job",
+            "name": "test",
+            "prompt": "hello",
+            "enabled_toolsets": ["terminal"],
+        }
+        fake_db, patches = self._make_run_job_patches(tmp_path)
+        # Even if the user has ``hermes tools`` configured to enable web+file
+        # for cron, the per-job override wins.
+        with patches[0], patches[1], patches[2], patches[3], patches[4], \
+             patch("run_agent.AIAgent") as mock_agent_cls, \
+             patch(
+                 "hermes_cli.tools_config._get_platform_tools",
+                 return_value={"web", "file"},
+             ):
+            mock_agent = MagicMock()
+            mock_agent.run_conversation.return_value = {"final_response": "ok"}
+            mock_agent_cls.return_value = mock_agent
+            run_job(job)
+
+        kwargs = mock_agent_cls.call_args.kwargs
+        assert kwargs["enabled_toolsets"] == ["terminal"]
 
     def test_run_job_empty_response_returns_empty_not_placeholder(self, tmp_path):
         """Empty final_response should stay empty for delivery logic (issue #2234).