Cover route-fold decisions with an independent corpus oracle - #728
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Route-fold safety checks depended on schedule-order facts without standing differential coverage. Add a test-only view of the production admission decision and compare it with an independent backward-writer oracle in the existing seeded graph corpus, plus bounded valid program hazards.
Three isolated guard removals fail the intended assertions. The retention control proves exclusive route readership; its same-master equality conjunct remains subsumed by the whole-list association proof and receives no independent mutation credit. Production predicates and source line positions are unchanged.
Validation: graph debug/release-unwind suites each passed 71 tests, strict focused Clippy and formatting passed, and exact mutation restoration was verified. Initial test-helper placement failure is preserved in the issue record. Independent Astra XHIGH final review precedes delivery.
Refs #220; #221 remains blocked until required PR/main qualification and synchronized closure. No production algorithm, artifact pin or benchmark change.
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