docs(marketing): add bounded Xquik Actor routes

[kriptoburak]

Summary

• add Xquik X Tweet Scraper and X Follower Scraper as explicit, optional Content OS research routes
• preserve configured X routes and require approval before paid collection
• document exact Actor Store links, current observed pricing, free alternatives, ROI, bounded inputs, cost caps, and privacy safeguards
• refresh the social-media mirror manifest

Validation improvements

Validation exposed several existing repository gaps, fixed in a separate commit:

• declare NumPy for a core tool imported during registry discovery
• include UI dependencies in the development dependency set used by contract tests
• restore the moved composition-validator path in make lint
• complete the mandatory render-runtime contract for the Anthropic talking-head pipeline
• skip drawtext integration tests only when the installed FFmpeg lacks that filter

Checks

• 1,027 passed, 13 skipped across tests/
• 445 passed, 6 skipped across tests/contracts/
• make lint
• pip check
• parsed both Actor input examples
• verified every social-media mirror byte count and SHA-256
• git diff --check

No Actor runs were started during validation.

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