fix: thread safety for concurrent subagent delegation (#1672)

* fix: thread safety for concurrent subagent delegation

Four thread-safety fixes that prevent crashes and data races when
running multiple subagents concurrently via delegate_task:

1. Remove redirect_stdout/stderr from delegate_tool — mutating global
   sys.stdout races with the spinner thread when multiple children start
   concurrently, causing segfaults. Children already run with
   quiet_mode=True so the redirect was redundant.

2. Split _run_single_child into _build_child_agent (main thread) +
   _run_single_child (worker thread). AIAgent construction creates
   httpx/SSL clients which are not thread-safe to initialize
   concurrently.

3. Add threading.Lock to SessionDB — subagents share the parent's
   SessionDB and call create_session/append_message from worker threads
   with no synchronization.

4. Add _active_children_lock to AIAgent — interrupt() iterates
   _active_children while worker threads append/remove children.

5. Add _client_cache_lock to auxiliary_client — multiple subagent
   threads may resolve clients concurrently via call_llm().

Based on PR #1471 by peteromallet.

* feat: Honcho base_url override via config.yaml + quick command alias type

Two features salvaged from PR #1576:

1. Honcho base_url override: allows pointing Hermes at a remote
   self-hosted Honcho deployment via config.yaml:

     honcho:
       base_url: "http://192.168.x.x:8000"

   When set, this overrides the Honcho SDK's environment mapping
   (production/local), enabling LAN/VPN Honcho deployments without
   requiring the server to live on localhost. Uses config.yaml instead
   of env var (HONCHO_URL) per project convention.

2. Quick command alias type: adds a new 'alias' quick command type
   that rewrites to another slash command before normal dispatch:

     quick_commands:
       sc:
         type: alias
         target: /context

   Supports both CLI and gateway. Arguments are forwarded to the
   target command.

Based on PR #1576 by redhelix.

---------

Co-authored-by: peteromallet <peteromallet@users.noreply.github.com>
Co-authored-by: redhelix <redhelix@users.noreply.github.com>

honcho_integration/client.py

@@ -69,6 +69,8 @@ class HonchoClientConfig:
     workspace_id: str = "hermes"
     api_key: str | None = None
     environment: str = "production"
+    # Optional base URL for self-hosted Honcho (overrides environment mapping)
+    base_url: str | None = None
     # Identity
     peer_name: str | None = None
     ai_peer: str = "hermes"
@@ -361,13 +363,34 @@ def get_honcho_client(config: HonchoClientConfig | None = None) -> Honcho:
             "Install it with: pip install honcho-ai"
         )
 
-    logger.info("Initializing Honcho client (host: %s, workspace: %s)", config.host, config.workspace_id)
+    # Allow config.yaml honcho.base_url to override the SDK's environment
+    # mapping, enabling remote self-hosted Honcho deployments without
+    # requiring the server to live on localhost.
+    resolved_base_url = config.base_url
+    if not resolved_base_url:
+        try:
+            from hermes_cli.config import load_config
+            hermes_cfg = load_config()
+            honcho_cfg = hermes_cfg.get("honcho", {})
+            if isinstance(honcho_cfg, dict):
+                resolved_base_url = honcho_cfg.get("base_url", "").strip() or None
+        except Exception:
+            pass
 
-    _honcho_client = Honcho(
-        workspace_id=config.workspace_id,
-        api_key=config.api_key,
-        environment=config.environment,
-    )
+    if resolved_base_url:
+        logger.info("Initializing Honcho client (base_url: %s, workspace: %s)", resolved_base_url, config.workspace_id)
+    else:
+        logger.info("Initializing Honcho client (host: %s, workspace: %s)", config.host, config.workspace_id)
+
+    kwargs: dict = {
+        "workspace_id": config.workspace_id,
+        "api_key": config.api_key,
+        "environment": config.environment,
+    }
+    if resolved_base_url:
+        kwargs["base_url"] = resolved_base_url
+
+    _honcho_client = Honcho(**kwargs)
 
     return _honcho_client