# T12: Multi-Turn Constraint Retention · Public Acceptance Basis v1.0

- Task ID: `T12`
- Frozen baseline: `ed2390f2df8252f062abd9123e20f6fffca7e5ed`
- Prompt SHA-256: `8669e1c8aa24340dfb05e34fa6181845bed68ba902f08bcb37186b89c55e79f5`

> These acceptance points were published separately after the batch finished, to support score review; they are not part of the agent-executable sample package.

## Acceptance points

- Round 1 implements `--by-category` with exact case-sensitive grouping; default summary output unchanged.
- The fixed round 2 must be sent in the same session; casefold-differing categories merge, displaying the original spelling of the smallest-ID record, ordered stably by casefolded key regardless of input order.
- Checks rerun after round 2; round-1 constraints still hold.