Rewrite organization copy with unslop

[kriptoburak]

Summary

• Convert public headings and labels to sentence case.
• Replace vague interface wording with specific repository and integration terms.
• Add the supported "Twitter API" phrase to the organization profile.
• Update the Codex OAuth note for CLI 0.147.0 and newer.
• Rewrite issue-template and workflow messages without changing their behavior.
• Keep validation rules aligned with the revised policy text.
• Reduce the commit by 2 lines.

Verification

• actionlint
• jq empty context7.json
• node --check scripts/check-public-contract.mjs
• node --check scripts/check-review-evidence.mjs
• node --check scripts/public-projects.mjs
• GITHUB_TOKEN=... node scripts/check-public-contract.mjs
• GITHUB_TOKEN=... node scripts/check-review-evidence.mjs
• git diff --check

The review verifier exits successfully and reports the existing x-twitter-scraper ratio warning.