Prepare AppRuntimeKit 0.2.0

[naviapis]

Summary

• prepare AppRuntimeKit 0.2.0 release metadata and repository automation
• unify activation, opening, and termination request results
• add validated process-identifier termination and focused runtime query/event seams
• replace single-instance policy with reusable duplicate-activation coordination
• align README, DocC, public API tests, and source boundaries with the exported contract

Developer impact

This pre-1.0 release intentionally changes public runtime result, error, lifecycle, and duplicate-activation APIs. Consumers must migrate using the 0.2.0 changelog.

Validation

• make check
• Debug and Release builds with complete strict concurrency and warnings as errors
• 193 tests
• swift package diagnose-api-breaking-changes v0.1.0 reviewed against the 0.2.0 changelog