chore: record the drain's two open questions as settled

[REPPL]

The product thinker settled itd-82's two open questions on 2026-10-10, so the drain's plan can be built.

• Decision 10: a trust-rule hand-back also leaves a marker on the open issue, naming the decision record it needs and its question, so a person finds it without reading the run's summary. The plan gains step 6 for it; the out-of-scope line on the ledger schema and criterion 5 now name the marker.
• Decision 11: major is let through only by a repository's own drain record, which invariant 19 already allows. There is no --allow-major flag, so this adds no work.
• The open questions section now reads as resolved, which abcd build requires before it starts.
• Captures that abcd intent ready reported itd-82 ready while abcd build refused it for those open questions.

Records only; no code changes.

Refs: itd-82
Refs: iss-2610101610446956
Assisted-by: Claude:claude-opus-5-5