chore(release): 2.0.0

[TheStreamCode]

Summary

Release 2.0.0: version bump for the discovery-only catalog (breaking: 4 providers removed).

Changes

• package.json + package-lock.json: 1.4.2 -> 2.0.0
• CITATION.cff: version 2.0.0
• CHANGELOG.md: [Unreleased] -> [2.0.0] - 2026-10-14

Testing

• [x]
  pm run lint && npm test passes on the release branch (CI matrix below)
• No code changes: version metadata only

Checklist

• PR is focused on a single concern
• README.md updated if user-facing behavior changed (N/A: badge reads npm)
• No API keys or credentials in code or examples
• New provider entries document the base URL, model behavior, and authentication requirements (N/A)
• Credential environment names are registered and tested when authentication is required (N/A)

Notes

• After merge: tag �2.0.0 + GitHub Release, which triggers the npm publish workflow.