- Added session-domain modules and exports for session-entries, context, listing, loader, and migrations.
- Changed persistence to async append writes plus writeTextAtomic, removing sync line APIs.
- Added compaction-aware session context rebuild with dangling tool-call cleanup.
- Added resumable session resolution with status inference, id/stem/suffix matching, and backup recovery.
- Added a `madeExecutable` result field to `WriteToolDetails` to surface executable changes.
- Implemented `maybeMarkExecutableForShebang` to chmod shebang files executable while preserving existing mode bits and swallowing chmod errors.
- Updated write flow and renderer output to return and display when a file was auto-marked executable.
can1357