Prototype TinFoil-backed web search flow

[AnthonyRonning]

Summary

• prototype replacing the Brave search execution path with a TinFoil chat-completions web-search subagent while keeping the existing search-needed classifier
• format TinFoil search output into the existing internal tool-result flow, with Brave/Kagi fallback for failures
• route web-search completion requests through the experimental tinfoil-proxy upstream and refresh the checked-in proxy binary

Notes

• this is a proof of concept we can keep iterating on tomorrow
• Tinfoil is investigating stale Exa results and additional date/context handling, so more follow-up changes are expected
• kept as a draft PR intentionally while we continue validating the approach

Validation

• cargo test --manifest-path "/Users/tony/Dev/OpenSecret/opensecret/Cargo.toml"
• cd "/Users/tony/Dev/OpenSecret/opensecret/tinfoil-proxy" && go test ./...

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