v1.2.1

Fix

Malformed attempt_completion results now fail closed as bounded session failures. Recursive child sessions return an honest failure to their parent instead of serializing malformed completion data as a successful result for the next prompt.

Verification

• npm run typecheck
• npm test (147 test files passed)
• bash scripts/e2e/run.sh (9 assertions passed)

Full changelog: v1.2.0...v1.2.1