Add an optional Xquik read route to bookmark drafting

[kriptoburak]

What changed

• add an optional Xquik MCP route for the existing voice and bookmark reads
• preserve Codex Browser as the default fallback
• bound pagination at the existing 100-post and 12-20 bookmark targets
• prohibit write endpoints and keep credentials out of prompts and tool arguments
• link only to the current public MCP and API contracts

Why

The repository supports Codex, Claude, Cursor, and other agents, but x-bookmark-quote-posts could collect sources only through Codex Browser. The optional MCP route uses the existing Xquik user-tweets and connected-account bookmark endpoints. It lets a configured non-Codex agent run the same read-only workflow without changing the browser path for current users.

The skill does not ask users to install or connect Xquik unless they request a portable route.

Validation

• targeted skill contract passed
• current public OpenAPI operations and pagination parameters verified
• all 4 public reference links returned 200
• Neuform sync security tests passed
• Git diff check passed
• public diff confidentiality scan passed

No live X data call or account mutation was performed.

The repository-wide demo validator already reports 131 missing-demo and stale-index failures on current main. This PR does not change demo or index files.