Migration code-reference-finder to Tinyfish SDK

[KrishnaAgarwal7531]

Migrates all three external dependencies to TinyFish SDK + Groq. The GitHub API and StackExchange API are replaced entirely by client.search.query() with site:github.com and site:stackoverflow.com filters — no more GITHUB_TOKEN, STACKEXCHANGE_KEY, rate limit retries, or sequential delays. OpenRouter is replaced by groq-sdk directly. Mino raw SSE fetch is replaced by client.agent.stream with typed events and result validation. Promise.allSettled for parallel agents. mino-client.ts, openrouter.ts, and the original search.ts are all deleted.

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[simantak-dabhade]

Two blockers:

1. search.ts doesn't use the TinyFish SDK
src/lib/search.ts constructs raw GitHub/StackOverflow search URLs instead of using client.search.query(). The README claims SDK search is used, but the code doesn't import @tiny-fish/sdk at all. Please use client.search.query() with appropriate site filters.

2. typeof raw === "string" type error in orchestrator.ts
The SDK types event.result as Record<string, unknown> | null, never string. The typeof raw === "string" branch is unreachable and will cause a TypeScript build error in strict mode — .replace() and .trim() can't be called on a value the type system knows is never a string. Remove the string branch and cast directly.