Add Xquik Search With Pagination and Fix PR Tests

[kriptoburak]

Summary

• add an optional Xquik search client with a fixed API host
• map search responses to the existing Tweet shape
• support cursor pagination and time-window filters
• validate credentials, inputs, and response contracts
• fix Fix PR checks #14 by running deterministic unit tests for fork PRs
• retain authenticated integration tests for trusted workflow events

Independent Fix

Fixes #14. Fork pull requests do not receive repository secrets, so the workflow now runs the deterministic unit suite for pull requests. Trusted pushes, schedules, and manual runs still exercise the authenticated suite.

Validation

• 51 unit tests pass
• ESLint passes
• TypeScript typecheck passes
• build passes
• Prettier check passes
• production dependency audit reports 0 vulnerabilities

Xquik is an independent third-party service. Not affiliated with X Corp. "Twitter" and "X" are trademarks of X Corp.

[kriptoburak]

Repaired this PR at signed head ab262f9. The Xquik client now uses the fixed documented host, supports cursor and time-window pagination, validates inputs and responses, and preserves the existing Tweet shape. This also fixes #14 by running deterministic unit tests for fork PRs while retaining authenticated tests for trusted runs. All 51 unit tests, lint, typecheck, build, formatting, and production dependency audit pass.