feat: add reviewed research context file

[kriptoburak]

What

Adds optional RESEARCH_CONTEXT_FILE support for the daily researcher. The pipeline appends a local reviewed context packet, treats it as untrusted source material, and still asks the researcher to verify important claims with web and X search.

Why

Operators may already have reviewed source packets from X/Twitter tooling, notes, transcripts, or internal research before the daily run. Passing that packet through a local file lets the agent start with better evidence without changing the writer, scheduler, or publisher responsibilities.

How

• Adds buildResearchPrompt() with a 12,000 character context cap.
• Documents a TweetClaw source-packet example for scrape tweets, search tweets, search replies, follower export notes, monitor summaries, and webhook observations.
• Adds RESEARCH_CONTEXT_FILE to .env.example and ignores local context/ files.
• Adds a regression test for the prompt builder.

Validation

• bun run typecheck
• bun run test
• bun run format:check
• bun run lint passes with 78 existing warnings and 0 errors
• README Markdown link check passed

[vercel]

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