fix: browser_vision ignores auxiliary.vision.timeout config (#2901)

* docs: unify hooks documentation — add plugin hooks to hooks page, add session:end event

The hooks page only documented gateway event hooks (HOOK.yaml system).
The plugins page listed plugin hooks (pre_tool_call, etc.) that weren't
referenced from the hooks page, which was confusing.

Changes:
- hooks.md: Add overview table showing both hook systems
- hooks.md: Add Plugin Hooks section with available hooks, callback
  signatures, and example
- hooks.md: Add missing session:end gateway event (emitted but undocumented)
- hooks.md: Mark pre_llm_call, post_llm_call, on_session_start,
  on_session_end as planned (defined in VALID_HOOKS but not yet invoked)
- hooks.md: Update info box to cross-reference plugin hooks
- hooks.md: Fix heading hierarchy (gateway content as subsections)
- plugins.md: Add cross-reference to hooks page for full details
- plugins.md: Mark planned hooks as (planned)

* fix: browser_vision ignores auxiliary.vision.timeout config

browser_vision called call_llm() without passing a timeout parameter,
so it always used the 30-second default in auxiliary_client.py. This
made vision analysis with local models (llama.cpp, ollama) impossible
since they typically need more than 30s for screenshot analysis.

Now browser_vision reads auxiliary.vision.timeout from config.yaml
(same config key that vision_analyze already uses) and passes it
through to call_llm().

Also bumped the default vision timeout from 30s to 120s in both
browser_vision and vision_analyze — 30s is too aggressive for local
models and the previous default silently failed for anyone running
vision locally.

Fixes user report from GamerGB1988.

tools/vision_tools.py

@@ -325,8 +325,9 @@ async def vision_analyze_tool(
         logger.info("Processing image with vision model...")
         
         # Call the vision API via centralized router.
-        # Read timeout from config.yaml (auxiliary.vision.timeout), default 30s.
-        vision_timeout = 30.0
+        # Read timeout from config.yaml (auxiliary.vision.timeout), default 120s.
+        # Local vision models (llama.cpp, ollama) can take well over 30s.
+        vision_timeout = 120.0
         try:
             from hermes_cli.config import load_config
             _cfg = load_config()