fix(agent): honor explicit web search requests

Promote explicit web-search phrasing to tool use and keep web_search/web_fetch available for that turn even when the stale web toggle is false.

tests/test_action_intents.py

@@ -49,6 +49,13 @@ def test_research_action_promotes_to_agent():
     assert message_needs_tools("can you look into GPU hosting options")
 
 
+def test_explicit_web_search_promotes_to_agent():
+    assert message_needs_tools("use web search and find a recipe for chocolate chip cookies")
+    assert message_needs_tools("do a web search for the best chocolate chip cookies")
+    assert message_needs_tools("search the web for current RTX 3090 prices")
+    assert classify_tool_intent("use web search and find a recipe").category == "web"
+
+
 def test_explanatory_calendar_questions_stay_plain_chat():
     assert not message_needs_tools("How do I add an entry to my calendar?")
     assert not message_needs_tools("What about the built-in Odysseus calendar, is that linked to email?")