christophevg / yoker / 28321496220

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fix(agent): populate Agent._tool_backends for Ollama web tools (M.5)

Agent._tool_backends was initialised to {} and never populated, so the
websearch/webfetch built-in tools failed with 'No backend configured'
even when the configured provider was Ollama.

Add create_web_backends() helper in agent/_setup.py that populates
OllamaWebSearchBackend / OllamaWebFetchBackend instances when:
- provider == 'ollama'
- an Ollama API key is configured (the tools are only registered when
  an API key is present, and the Ollama SDK web_search/web_fetch calls
  require an authenticated client)
- the corresponding tool is enabled in config

Wire the helper into Agent.__init__ so _tool_backends is populated
during agent setup using the agent's AsyncClient.

Scope is intentionally minimal: this only fixes the pre-existing Ollama
path. Extending web tools to non-Ollama providers remains out of scope
(see analysis/multi-provider-backend-design.md §7.4 and §9.17 Q17) and
will be handled by the multi-provider backend effort.

Adds 8 tests covering backend population (ollama with/without api key,
disabled tool, client reuse) and end-to-end tool execution via the
agent's ToolContext.

Mark M.5 complete in TODO.md.

🤖 Implemented together with a coding agent.

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