Tom Boucher a155ff4fb6 fix(#4055): verify a phase branch is genuinely new before create-and-switch (#4694) ...

* test(#4055): full-lifecycle regression for merged-branch resurrection

* fix(#4055): verify a phase branch is genuinely new before create-and-switch

* test(#4055): assert branch absence via the gitOrThrow throw contract

* test(#4055): observe the refusal disclosure via the process seam

* chore(#4055): add changeset fragment

* test(#4055): drop an unused fixture variable

* fix(#4055): name the milestone-arm residual and the guard degradations

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Co-authored-by: sim <sim@local>

2026-09-13 10:48:34 -04:00

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