fix(codelayer): restrict web researcher browser tools

[dexhorthy]

HumanLayer Task

Why the change

The Codelayer web researcher needs a strict prompt that keeps it on web search and fetch tools unless the user asks for browser control.

Special things to note

• This prompt is intentionally verbatim and replaces all prior research and output guidance.
• The matching Claude Code agent change is in synclayer#2267.

Change outline

The shared specialist now receives one narrow browser-use rule.

 createWebSearchResearcherAgent
-  broad research workflow, source, and output instructions
+  do not use browser-control tools or skills unless explicitly requested
+  use web search and fetch tools by default

[github-actions]

Docs Agent Review

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