feat: human-like typing for browser Google and YouTube search

Make the browser search helper search the way a person does: load the
site home page, type the query into the search box one key at a time, and
press Enter — for both Google `search` and `youtube` — instead of jumping
straight to a results URL. Supports the goal of a human-like assistant.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/jarvis/tools/builtin/web_search.spec.md

@@ -22,7 +22,10 @@ path (evals, text entry) and falls back to the master flag:
 
 - **on-screen Chrome**: `browser_search()` drives Chrome (Node CDP helper
   `bot/scripts/stream-test/browse-search.mjs`) to Google-search the query, so
-  the action is visible on the Go-Live broadcast. When no broadcast Chrome is
+  the action is visible on the Go-Live broadcast. The helper searches the
+  human way — it loads the site home page, types the query into the search box
+  one key at a time, and presses Enter (both Google `search` and `youtube`),
+  rather than jumping to a results URL. When no broadcast Chrome is
   reachable on CDP (e.g. a plain text turn with no active broadcast), the helper
   falls back, for `search` only, to launching its own Chrome so browser-based
   Google search still works with no API cost. Fallback order: