fix(banner): show honcho tools as available when configured (#3810)

The honcho check_fn only checked runtime session state, which isn't
set until the agent initializes. At banner time, honcho tools showed
as red/disabled even when properly configured.

Now checks configuration (enabled + api_key/base_url) as a fallback
when the session context isn't active yet. Fast path (session active)
unchanged; slow path (config check) only runs at banner time.

Adds 4 tests covering: session active, configured but no session,
not configured, and import failure graceful fallback.

Closes #1843.

tools/honcho_tools.py

@@ -45,8 +45,23 @@ def clear_session_context() -> None:
 # ── Availability check ──
 
 def _check_honcho_available() -> bool:
-    """Tool is only available when Honcho is active."""
-    return _session_manager is not None and _session_key is not None
+    """Tool is available when Honcho is active OR configured.
+
+    At banner time the session context hasn't been injected yet, but if
+    a valid config exists the tools *will* activate once the agent starts.
+    Returning True for "configured" prevents the banner from marking
+    honcho tools as red/disabled when they're actually going to work.
+    """
+    # Fast path: session already active (mid-conversation)
+    if _session_manager is not None and _session_key is not None:
+        return True
+    # Slow path: check if Honcho is configured (banner time)
+    try:
+        from honcho_integration.client import HonchoClientConfig
+        cfg = HonchoClientConfig.from_global_config()
+        return cfg.enabled and bool(cfg.api_key or cfg.base_url)
+    except Exception:
+        return False
 
 
 def _resolve_session_context(**kwargs):