[Feature] Track TypeScript 7 beta compatibility

[ConnorQi01]

Summary

Track whether the current codebase remains compatible as TypeScript 7 moves from preview to beta.

Proposed Changes

• Revalidate the current codebase against the TS7 beta toolchain
• Compare beta behavior with the existing preview-era compatibility baseline
• Record any new type, build, test, or API regressions separately from older fixes

Test Plan

• npx tsc --noEmit
• gulp build
• npm test
• smoke test coverage for activation, commands, and debugging flows