Site rig follow-ups after stable: judges at margin 0 (#1914) #1939

Follow-ups from the final review of #1914 (head dbc4332) on 28 Oct 2026. None of them makes the PR worse than master or breaks the owner's fuse rule, so they wait until after stable.

• test(site): pin the width of s18's skip after the house step
• test(site): replay a rig record through the judges without the rig
• control: s18 sim with several house steps at margin 0 (keep review's closed-loop case)

test(site): pin the width of s18's skip after the house step

TestS18OwnCommandsSkipTheHouseStep checks overages at 50 s and 150 s, but nothing between 10 s and 50 s after small_step. Review mutation on dbc4332: change the second window from minor (small+10) to d.window(small+45, none). The test still passes, so the judge could skip 45 s of Core's own commands. Test idea: add a 4 s overage that starts at small+12 (inside the minor window) and must fail; add one at small+6 that must pass.

test(site): replay a rig record through the judges without the rig

For each judge change in this stack (s18 on dbc4332), the PR body quotes numbers from a rig record, such as "own commands peak at 16.008 A". Nobody can check them without the runner, because no command re-judges a saved results directory. Test idea: a go test ./test/site -run TestRejudge -args -dir <results> hook that loads ftw.jsonl and marks, then prints metrics and criteria. Then check that the fdfbfec s18 record gives max_i_own_commands <= 16.01.

control: s18 sim with several house steps at margin 0 (keep review's closed-loop case)

Review ran s18 at margin 0 with house steps +0.1 A, -0.7 A, +0.5 A on one phase only, -0.5 A and +0.3 A, one minute apart. Core's own commands peaked at 16.005 A outside the 10 s after each upward step. The longest stretch over 16 A was 3 s, and the physical peak was 16.50 A. It passes on dbc4332. Today only TestBatteryBesideMinimumCarHoldsTheFuseLine covers a single +0.1 A step. Test idea: add this sequence as a sitesim test asserting own peak <= 16.01 A and each overage < 10 s, so that a later raise that overshoots after a house drop gets caught.

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