ios: result rule lines say at least / at most (B-14, #36)

[AidenJohnston]

Fixes #36 (B-14 in the verification bug triage).

Fixes #40.

#40, an overlap read as clearance. "Measured 1 ft 3 in. The rule is 0 in" was a spot 1 ft 3 in inside the meter's working space (measured_ft -1.25); Distance.feetAndInches drops the sign. A measurement below zero now reads "Overlaps by 1 ft 3 in", and a minimum of 0 reads "The rule is no overlap". Separate commit. The app target has no unit-test bundle, so the check is a new screen state: -uiDemoOverlap puts run 2's line in the sample result, and result-overlap asserts the row's VoiceOver value (and runs the accessibility audit on it).

Before: "Measured 3 ft. The rule is 20 ft, and the measurement can be off by about 4 in." The 20 ft is the cable run's maximum, but the line reads like a minimum that 3 ft fails.
After: "Measured 3 ft. The rule is at most 20 ft, …" and, for clearances, "The rule is at least 3 ft, …". A check the server sends without comparison keeps the bare distance.

Change. One commit:

• CheckRow gets a comparison (RuleComparison.atLeast / .atMost), filled from the server's checks[].comparison, which HouseScanKit already decodes (ScanEngine+Export.swift).
• ScanCopy.measurement words the limit from it (ScanCopy.ruleLimit).
• The demo result's window row carries .atLeast.

Tests. The wording lives in the app, not in HouseScanKit, so there's no new package test; the kit already covers decoding comparison (PlacementResultTests). ScreenStatesUITests.testWholeFlowThroughTheButtons now asserts that the result's window row reads "The rule is at least 3" (the unit is left off, since VoiceOver spells it out once #34 lands).

Not in this PR. review_threshold_ft (the 15 ft review line on the cable run) is still ignored; #36 lists it as a follow-up. The rest of the triage recheck at 49a676e:

• B-03 and B-04: already fixed at d8f220f and f9a4247.
• B-06: fixed by Sam's 3c7b83a, merged into this branch at 97ee40c.
• B-12: open, filed as Past-end requests: a band request beyond a marked end never fills, and a past_end request drops the end #35. The two leftovers are listed on "Can't get there" during the walk can put the wall's end at the meter, and the rest of the walk is dropped #24.

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[SamGu-NRX]

Current head 21e21ce fails the iOS check in JSONSchemaValidatorTests.vendoredCopiesMatchServer: the vendored ios/HouseScanKit/Tests/HouseScanKitTests/Schemas/scene.schema.json differs from the current server/schemas/scene.schema.json fetched from t3/server (run). The job stops in HouseScanKit tests, before the app build and UI assertion for B-14. Please reconcile the vendored schema with the server branch on your PR branch and rerun the current-head check; #10 and #34 are still running and may show the same shared-contract drift.

[SamGu-NRX]

Read-only follow-up on current head 3b27aaf: the new overlapSample inserts a check saying the battery overlaps the meter working space by 1 ft 3 in, but it inherits reviewSample.spot at s=0.55...1.34 m while the sample meter zone ends at s=0.38 m (DemoEngine.swift:928,945,957-965). The preview therefore draws a 0.17 m gap beside an overlap warning. Please make the demo spot/zone geometry and related summary/clearance outcome consistent with the overlap check, or keep the test limited to copy without presenting it as a coherent result. The signed-overlap wording itself addresses #40; current-head CI is still running.

[SamGu-NRX]

Current head 3b27aaf now passes HouseScanKit tests and app build after the schema refresh, but iOS CI is still red. FullFlowUITests.testFullFlowFromReplay failed during Simulator app relaunch with Failed to terminate dev.housescanning.housescan:13374: Failed to terminate ...:0 (run 36276096175). The new overlap UI state and accessibility audit passed in that run; this particular failure looks like Simulator lifecycle trouble, not an assertion on B-14/#40. Please rerun or investigate without treating the red check as a pass. My prior comment about sample geometry also remains.

[SamGu-NRX]

Review gate remains open at 3b27aaf: the overlap demo geometry finding in my earlier comment has no fix or reasoned disposition yet. The PR is now also CONFLICTING with t3/ios-mvf after #10 refreshed the same vendored schema. Please reconcile the branch and the Simulator lifecycle failure, then I will recheck the new head before posting the exact no-open-findings line.

[AidenJohnston]

I merged the current t3/ios-mvf (which now includes #34) into this branch. ScanCopy.measurement conflicted: this PR adds the "at least / at most" wording and "Overlaps by", while #34 added a spoken mode so VoiceOver hears "feet" and "inches". I kept both by passing the length formatter into measuredLine and ruleLimit. Because the check row's VoiceOver value now uses spoken units, I updated the result-overlap expectation to "Overlaps by 1 foot 3 inches. The rule is no overlap".

The schema test conflict was comment wrapping only. The base already has the same vendored schemas from t3/server 074bf1d, so I took its copy.

The previous iOS failure was XCTest failing to terminate the app before testFullFlowFromReplay launched it. That looks like a simulator flake rather than something this PR changed, and this push reruns it.

[SamGu-NRX]

I checked the 067cec7 merge resolution. It reintroduces let length = spoken ? Distance.spoken : Distance.feetAndInches in ScanCopy.measurement, the same conditional reference that made Xcode 26.6 fail to compile #34 at e760327. Please keep the compiler-friendly local func length(_:) form that #34 used when reconciling B-14/#40, unless current-head CI proves this expression compiles in the new context. The overlap demo geometry finding remains unanswered as well; no review-clear gate yet.

[SamGu-NRX]

Current-head iOS CI passed at 067cec7, including app compilation and the overlap UI state. That disproves my earlier compiler-risk concern about the conditional Distance method reference in this merged context; I withdraw that point. The demo still depicts a gap between the battery and meter zone while its check says they overlap (DemoEngine.swift sample spot 0.55...1.34 m, zone ending at 0.38 m). Please fix or give a reasoned disposition for that inconsistency before the review-clear gate.

[SamGu-NRX]

@AidenJohnston Follow-up after merge at cd05d67: the signed-overlap copy passed iOS CI, but DemoEngine.overlapSample still inherits a battery spot at s=0.55...1.34 m while its meter zone ends at s=0.38 m. The result preview draws a 0.17 m gap beside a check saying "Overlaps by 1 ft 3 in." Please align the demo spot/zone geometry and its check or keep this as a copy-only fixture. The compiler-risk concern was withdrawn after CI; this sample inconsistency was still open when merged.

[SamGu-NRX]

@AidenJohnston Rechecked the follow-up in integration fb4c30ef0b2a49174286473b25e70f4435fc4daa. Changing the made-up overlap from -0.381 m to -0.3048 m leaves the carried finding unchanged: overlapSample still inherits the spot at 0.55...1.34 m and a passing meter zone ending at 0.38 m. The preview depicts a gap while the row says it overlaps by 1 ft. Please change the geometry/outcome together or isolate this as a copy-only test without a contradictory result preview.