Tanmoy Sarkar 1fc57b22a8 test(companion): Add transactional reread test
Add the missing transactionality assertion to the existing reread coverage: a
batch that would change one companion and add another but also contains a
duplicate name is rejected as a whole. The process set and configs stay
untouched and no fork or kill happens, proving nothing is applied on validation
failure.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
2026-06-09 23:06:28 +05:30
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