v1.2.0

Summary

• Release the current main integration branch through the release branch, per AGENTS.md.
• Includes native mobile app structure, mobile voice diagnostics export, voice stability guards, playback/listening recovery, and continuous STT keepalive improvements.
• Aligns repository, Web, Mobile, and shared package versions to 1.2.0.
• Sets mobile app version to 1.2.0 with iOS build number and Android versionCode 2026053107.

Verification

• npm run lint
• npm test
• npm run mobile:config
• PR #217 CI passed before merging to main.

Issues

• Closes #216