[cgraf78]

Summary

Place the managed cron block first so its shell, environment and path also apply to later unmanaged jobs. Later unmanaged assignments continue to override earlier values for subsequent jobs.

• Relocate existing bottom-positioned blocks even when their contents are unchanged and report misplaced blocks in doctor.
• Refuse ambiguous markers and re-read the crontab before rewriting; the crontab interface still has no atomic compare-and-swap.
• Document that formerly preceding unmanaged assignments no longer configure managed jobs after migration.

Testing

• dot test (38 suites passed, one skip; an earlier unrelated prompt test failure did not reproduce in isolation or on the full rerun)
• dot test core-cron core-doctor (passed)
• checkrun format and checkrun lint (passed)
• ShellCheck inventory and git diff --check (passed)
• Personal cron fragment integration against the staged base (42 assertions passed)

Review

Independent review covered malformed and duplicate markers, migration, idempotence, doctor alignment, concurrent edits and effects on unmanaged jobs.