ROW-ID — one row per PR.

• Issue/PR search and existing claim:
• Pull request shape selected at row claim:
• Roadmap or matrix row, plus scripts/ready-for-helper.py result when applicable:
• Exact current-code and test/evidence anchors inspected:

• scripts/agent-preflight.sh passes
• tests that cover this change (name them):
• same-change doc obligations (docs/STATUS.md, docs/BENCHMARKS.md, and docs/FEATURES.md if a feature/model/backend/quant surface moved)

• This PR makes NO speed claim (helpers may not: the GPU is operator-serialized and a contended benchmark is void), or
• the operator ran the numbers under ${GPU_LOCK} and they are recorded in docs/BENCHMARKS.md with the repro recipe.

FOLLOWING_AGENTS_PROTOCOL

Following-Agents-Protocol: true AI-Assisted: true Assisted-by: AGENT:MODEL [TOOL]