feat: add optional Hermes Tweet read backend

[kriptoburak]

Summary

• Add an explicit Hermes Tweet / Xquik read backend for search, profile, thread, and single-tweet reads.
• Normalize backend responses into the existing Tweet shape so current CLI, formatter, and MCP read flows keep working.
• Document optional XINT_READ_BACKEND=hermes-tweet, API key, and base URL setup while keeping X API v2 as the default path.

Validation

• bun test lib/hermes_tweet.test.ts
• bun x tsc --ignoreConfig --noEmit --target ESNext --module ESNext --moduleResolution bundler --strict --esModuleInterop --skipLibCheck --types bun-types,node lib/hermes_tweet.ts lib/hermes_tweet.test.ts lib/api.ts
• bun test
• git diff --cached --check
• curl -fsSIL https://xquik.com

Typecheck Note

• bun run typecheck currently fails on the base repo before this change because lib/spinner and lib/news are missing imports from existing files.