chore: round-2 review nits (re-review #9)

- tests/agent/test_session_activity.py asserts against
  ACTIVITY_DESCRIPTION_MAX instead of the literal 120.
- The session-stall WARNING log line names its config knob
  (agent.session_stall_timeout) so operators can find the setting.
- hermes_state.py: collapse the triple blank line near line 191.
- hermes_cli/status.py no longer imports the private
  hermes_cli.main._relative_time: the helper moved to a public home
  (hermes_cli.timefmt.relative_time); main._relative_time stays as a
  thin back-compat wrapper (sessions_cmd and external patchers keep
  working).

gateway/run.py

@@ -11964,7 +11964,8 @@ class GatewayRunner(GatewayAuthorizationMixin, GatewayKanbanWatchersMixin, Gatew
             logger.warning(
                 "Session stall detected: session=%s idle=%.0fs "
                 "(timeout=%.0fs, ~%d min); pending inbound present "
-                "| last_activity=%s | provenance=%s",
+                "| last_activity=%s | provenance=%s "
+                "(agent.session_stall_timeout)",
                 session_key,
                 idle_seconds,
                 timeout_seconds,

hermes_cli/main.py

@@ -944,21 +944,15 @@ def _termux_should_prefetch_update_check() -> bool:
 
 
 def _relative_time(ts) -> str:
-    """Format a timestamp as relative time (e.g., '2h ago', 'yesterday')."""
-    if not ts:
-        return "?"
-    delta = _time.time() - ts
-    if delta < 60:
-        return "just now"
-    if delta < 3600:
-        return f"{int(delta / 60)}m ago"
-    if delta < 86400:
-        return f"{int(delta / 3600)}h ago"
-    if delta < 172800:
-        return "yesterday"
-    if delta < 604800:
-        return f"{int(delta / 86400)}d ago"
-    return datetime.fromtimestamp(ts).strftime("%Y-%m-%d")
+    """Format a timestamp as relative time (e.g., '2h ago', 'yesterday').
+
+    Thin wrapper kept for backward compatibility; the implementation lives
+    in :mod:`hermes_cli.timefmt` so lightweight consumers don't have to
+    import the whole CLI surface.
+    """
+    from hermes_cli.timefmt import relative_time
+
+    return relative_time(ts)
 
 
 def _has_any_provider_configured() -> bool:

hermes_cli/status.py

@@ -65,9 +65,9 @@ def _format_iso_timestamp(value) -> str:
 
 def _format_relative_ts(ts: float) -> str:
     """Format an epoch timestamp as a short relative age for status output."""
-    from hermes_cli.main import _relative_time
+    from hermes_cli.timefmt import relative_time
 
-    return _relative_time(ts)
+    return relative_time(ts)
 
 
 def _configured_model_label(config: dict) -> str:

hermes_cli/timefmt.py

@@ -0,0 +1,30 @@
+"""Small shared time-formatting helpers for CLI output.
+
+Public home for helpers that used to live as private functions on
+``hermes_cli.main`` — importing that module drags in the whole CLI
+surface, which lightweight consumers (``hermes status``, dump tooling)
+should not pay for.
+"""
+
+from __future__ import annotations
+
+import time as _time
+from datetime import datetime
+
+
+def relative_time(ts) -> str:
+    """Format a timestamp as relative time (e.g., '2h ago', 'yesterday')."""
+    if not ts:
+        return "?"
+    delta = _time.time() - ts
+    if delta < 60:
+        return "just now"
+    if delta < 3600:
+        return f"{int(delta / 60)}m ago"
+    if delta < 86400:
+        return f"{int(delta / 3600)}h ago"
+    if delta < 172800:
+        return "yesterday"
+    if delta < 604800:
+        return f"{int(delta / 86400)}d ago"
+    return datetime.fromtimestamp(ts).strftime("%Y-%m-%d")

hermes_state.py

@@ -188,7 +188,6 @@ def _workspace_key_clause(key: str) -> Tuple[str, List[str]]:
     )
 
 
-
 def _collect_delegate_child_ids(conn, parent_ids: List[str]) -> List[str]:
     """Delegate-subagent ids to cascade-delete with *parent_ids*.
 

tests/agent/test_session_activity.py

@@ -3,6 +3,7 @@
 from types import SimpleNamespace
 
 from agent.session_activity import (
+    ACTIVITY_DESCRIPTION_MAX,
     ActivityProvenance,
     bound_activity_description,
     build_activity_snapshot,
@@ -12,9 +13,9 @@ from agent.session_activity import (
 
 
 def test_bound_activity_description_truncates():
-    long = "x" * 200
+    long = "x" * (ACTIVITY_DESCRIPTION_MAX + 80)
     out = bound_activity_description(long)
-    assert len(out) == 120
+    assert len(out) == ACTIVITY_DESCRIPTION_MAX
     assert out.endswith("…")