Symmetry-Sector Mitigation Planner Fixtures

These no-QPU fixtures lock the planner contract before execution-path integration.

Fixture	Status	Primitives	Blockers
eligible_counts_guess	eligible	parity_postselection, symmetry_expansion, guess_symmetry_decay	none
blocked_missing_counts	blocked	none	raw measurement counts are required before mitigation planning
blocked_missing_guess_observables	blocked	none	GUESS requires noise-scaled symmetry observables
blocked_nonsymmetric_coupling	blocked	none	coupling_matrix must be symmetric for XY parity-sector planning

Raw-count replay fixtures

Fixture	Status	Applied primitives	Deferred primitives	Blockers
replay_counts_postselection_expansion	applied	parity_postselection, symmetry_expansion	guess_symmetry_decay	GUESS replay requires calibrated noise-scaled symmetry observable rows
replay_blocked_missing_counts	blocked	none	none	symmetry-sector plan is blocked: ('raw measurement counts are required before mitigation planning',)

Reproducibility gate

Regenerate and compare the fixtures with:

scpn-bench symmetry-sector-mitigation-gate

Claim boundary

Planner fixtures prove deterministic eligibility/blocker outputs. Replay fixtures prove offline raw-count accounting. They do not mutate circuits, submit hardware jobs, or prove hardware improvement.