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]

Review: changes requested

SDK migration is well done — client.search.query() and client.agent.stream() used correctly, old mino-client.ts and openrouter.ts properly deleted, no secrets, no Mino refs.

Build is broken due to a type mismatch and there's a dead file that needs removing.

Blockers

1. apiData removed from type but still referenced

src/lib/goal-builder.ts:53 accesses searchResult.apiData but the SearchResult interface in types.ts no longer has an apiData property. This breaks the build.

Fix: either remove the apiData usage from goal-builder.ts (use searchResult.snippet as fallback), or add apiData?: { body_excerpt?: string } back to the SearchResult interface.

2. Delete dead src/lib/groq-client.ts

This file imports groq-sdk which isn't in package.json and is never imported by any other file. It's completely dead code. Delete it.

3. Remove next-env.d.ts

Auto-generated by Next.js, should not be committed. Delete it and add next-env.d.ts to .gitignore.

Non-blocking

4. README says "Tailwind CSS 4" but package.json has tailwindcss ^3.4.17 — fix the README.
5. README constraint checklist mentions "Mino" in a row label — change to just "Raw SSE fetch?"

Once the build passes (npm install && npm run build), this is good to merge.