refactor(runtime): remove unused plugin projection path

[mldangelo-oai]

Summary

Remove a bundled-plugin projection path that cannot run in the published package.

Changes

• Stage validated plugins through the existing safe plugin-tree copier.
• Delete the unused projection-contract parser and alternate copy implementation.

Testing

• bun test tests-ts/runtime.test.ts --timeout 30000 — 118 passed; 7 Windows-only tests skipped on macOS.
• pnpm run types — passed.
• prettier --check src/runtime.ts — passed.
• git diff --check — passed.

Risk and rollout

The bundled package does not contain the private projection contract required by the removed branch. The existing plugin copier continues to enforce path and symlink protections, honor cancellation, and clean up failed copies.

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.

[mldangelo-oai]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Keep them coming!

Reviewed commit: 4b732db869

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[chatgpt-codex-connector]

Security review completed. No security issues were found in this pull request.

Reviewed commit: 4b732db869

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[zcrab-oai]

Looks good. Removes an unreachable plugin projection branch while retaining safe tree copying, path checks, and cancellation.