Sign the UK local release's gate-only failures for the local line (#1301)

[juaristi22]

The gate-only sign-off for the UK local release (#1301), approved by juaristi22 on 2026-10-19. Merge it with a merge commit, after #1310: the release build runs at this PR's head, and its commit must stay in main's history.

It stacks on #1310 (the fixes the release builds need), so until #1310 merges, the diff here also shows #1310's three commits. This PR's own commits are the last two.

Which builds

• The measured build is the second dense build, attempt uk-local-candidate-f100-s42-20261018T161007Z-35fb4c89, at 07d6b43e7 (UK local release builds: deferred-cell legs, the savings-interest renewal and the export surface's high-value support columns (#1301) #1310's head).
  • The first build failed uk_export_surface, which no sign-off can cover, and UK local release builds: deferred-cell legs, the savings-interest renewal and the export surface's high-value support columns (#1301) #1310 fixed that.
  • The second build reproduced the first byte for byte on every target row, and was blocked only by gate-only failures.
• tools/draft_uk_dense_signoff.py names the measured build "build 1" and the reuse build "build 2". That wording is in the drafted reasons and stays as drafted, because --verify checks the committed entries against the draft.
• The reuse build (--require-solve-reuse, gate clock 2026-10-19) runs at this PR's head and stages the release candidate.

The sign-off (810315ac2)

The drafter's patch, unchanged except for the changelog's wording. Register data and test pins only. Every signed row stays bound in the solve: each entry is scoped to the local line and suppresses only its release fence. A build in which a signed row passes fails its entry as stale.

Register	Added	Renewed	Kept	Retired	Rescoped	For review
National target-fit rows (uk_target_fit)	15	0	0	0	0	0
Local target-fit cells (uk_local_target_fit)	31	0	0	0	0	0
Areas below the support floor (uk_local_area_support)	2	0	4	0	0	0

• National target-fit rows: 1 stale-risk, 2 near-bound. Stale-risk counts signed rows within 0.01 above the bound; near-bound counts unsigned rows within the same margin below it. The local registers' counts are not printed here.
• The two new areas are the Na h-Eileanan Siar constituency (S14000027) and council area (S12000013). Both missed the area-support floor. They stay in the solve and are flagged support_below_floor in the build's area-support table.
• Window: fit entries expire 2026-11-16, area entries 2027-01-19. The reuse build's gate clock must be from 2026-10-19 to 2026-11-03.
• Assembly deadline: 2026-11-03, when slc.borrowers.plan_2_above_threshold and slc.borrowers.plan_2_liable expire. The reuse build, its --verify and the release assembly must all run by then.
• The drafter predicts the reuse build passes uk_target_fit, uk_local_target_fit and uk_local_area_support.

The pin round-trip test (356dc4f7f)

test_the_committed_pins_rewrite_and_reparse rewrote every committed pin back with local_only=False. That held only while the gate-only registers were empty. The drafter adds the local-line scope pin whenever every entry of a register is local-only, so the first real sign-off failed the test. It now rewrites back with the scope the committed register has, as the drafter decides it. Test-only.

Tests

These ran locally at this head and pass:

• the drafter's list: council tax targets, geography sources, local-authority input, terminal gates, weighted integrity;
• plus the sign-off draft, solve scope, country spec, local gate battery, battery bindings, national graph and full-build CLI tests;
• the engine test_uk_graph_terminal.py.

Disclosure

This body and the patch carry only:

• gate ids and predicted verdicts;
• the attempt id and report digest;
• register entry counts, and the national register's stale-risk and near-bound counts;
• register keys and area names;
• policy bounds and floors;
• the reviewer, the adjudication and policy dates;
• test paths.

Per-row errors, the local registers' stale-risk and near-bound counts, and per-area support figures stay in the private review file outside every git work tree.

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