cases3

1. 2026-10-24 Cutting between words preserves a sentence's meaning

   now fails loudly Regression tests require the full selected context and its governing modal to survive cloze construction.

   InvariantsTest EffectivenessRuntime InvariantsMutation Testing

2. 2026-10-07 A placeholder written for a reader was a broken link the site's own checker followed

   now fails loudly a build gate fails when generated text carries a literal <...> placeholder inside an http(s) URL, so a placeholder cannot ship as a 404-ing link on the site's own domain

   StructuralTest EffectivenessPre-Promotion Invariant GatesSnapshot Tests

3. 2026-09-19 Hardcoding a "recent" date into a test fixture keeps it recent

   now fails loudly the telemetry collector accepts SUBLAYER_NOW to freeze its clock, and the test pins it to the fixtures' own day, so the window is deterministic and cannot age out

   BehavioralTest EffectivenessExample-Based TestsPre-Promotion Invariant Gates