systematics_checker

mode: subagent — runs alongside/after the core spectra computation.

What it does

Identifies and quantifies systematic contamination in the power spectra: cross-correlation against ingested templates, deprojection, and null-test design. Calls build_systematics_evidence — the deterministic hard gate — and relays its verdict.

On a FAIL, it emits one NEEDS_INPUT: line; it never silently overrides a failing check. override_systematics_gate is an explicit, audited human action, not something this agent decides on its own. See Determinism & no fabrication.

For a B-mode (BB/EB) failure it relays the deterministic classification the gate attaches — BENIGN_NOISE_MODEL / BENIGN_FLAG / COLORED_EXCESS, with α and p_rescaled — and is forbidden from inventing a physical cause (intrinsic alignments, projection, "real simulation feature"). A COLORED_EXCESS is the trigger to offer the random-rotation ensemble (remote only when a site is registered). See B-mode validation.