fix(plugin): pin the MCP formatter

[mldangelo-oai]

Summary

The MCP app needs its own pinned formatter when the plugin is installed without the SDK. Reusing the SDK's Prettier in #988 left standalone imports dependent on the host repository's formatter version.

Changes

• Pin Prettier 3.9.6 in the MCP app and its lockfile.
• Run the changed-file formatting check through the MCP app's dependencies.

Testing

• Frozen dependency installation passed with lifecycle scripts disabled.
• Ran the pinned formatter over the five affected MCP files; all were unchanged.
• git diff --check passed.
• Tests will run in CI, as requested. No local tests were run.

Risk and rollout

This changes development tooling and CI. The pinned version matches the formatter already used by the SDK. Runtime code and native build inputs are unchanged.

Public disclosure review

• No customer, partner, prospect, or user identities, data, or identifying details are included.
• No credentials, personal data, private source, scan findings, or nonpublic links or tickets are included.
• I reviewed the branch name, title, description, commits, changes, comments, logs, screenshots, attachments, and links for public disclosure.

[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-22T01:07:31.450763Z	714d5a5	Manual request
🔒 Security Review	✅ Completed 2026-09-22T01:07:45.852076Z	714d5a5	PR opened

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[mldangelo-oai]

@codex review

Please review head 714d5a533cb7a4a9aeb6c72dd197fdda9b2ba1bb. This pins Prettier in the MCP app and makes its CI formatting check use that dependency. Tests are running in CI; no local tests were run.

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Swish!

Reviewed commit: 714d5a533c

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