Introduce PULSE_ALLOW_CONTRACT_NEUTRAL_COMMIT as a narrow escape
hatch for the canonical-shape block in staged_commit_shape_guard
and canonical_completion_guard. A non-empty reason logs to stderr
for audit and suppresses only the canonical-shape requirements;
lane-progress, promotion-proof, sensitivity, gitleaks,
governance-stage, control-plane, status, registry, and contract
audits still run. Previously a behavioral bug fix on a canonical
runtime path demanded full contract + verification ceremony even
when no public-contract delta existed, forcing --no-verify.
rcourtman
675c47d971