- fix(background): include "interrupt" status in all terminal status checks (3 files)
- fix(background): display "INTERRUPTED" instead of "CANCELLED" for interrupted tasks
- fix(cli): add error recovery grace period in poll-for-completion
- fix(lsp): use JSONC parser for config loading to support comments
All changes verified with tests and typecheck.
pollForCompletion exited immediately when session went idle before agent
created TODOs or registered children (0 todos + 0 children = vacuously
complete). Add consecutive stability checks (3x500ms debounce) and
currentTool guard to prevent premature exit.
Extract pollForCompletion to dedicated module for testability.
