# n213 — The reframe that survives n212: the audit is a gauge-FIXING, and the sector's three problems merge into one number

**Date:** 2026-07-11 · **Follows n212 (adverse).** In-session Dirac analysis with the physical channel-structured stiffness; 7 momenta including generic directions.

## The reframe [B]

n212 killed the reading "the audit = GR's constraint *symmetry*" — zero first-class constraints, kinematically. But eight second-class constraints with DOF = 2 is precisely the canonical structure of **gauge-fixed linearized GR** (4 constraints + 4 gauge conditions, all second-class after fixing). And that is the structure a *measuring* vacuum should have: gauge redundancy is unobservability, and the monitor observes — **measurement fixes gauge**. The audit watches both members of the conjugate pairs (the violation *and* its rate), which is exactly what a constraint-plus-condition pair looks like. The correct target was never "derive the diffeomorphism symmetry"; it is "derive GR *in the monitor's gauge*."

## The computation

With the toy gradient stiffness, n212 found the DOF count collapsing off-axis (2 → 1 → 0). With the **physical, channel-structured stiffness** — watched subspace at S_watch, dark subspace at S_TT, built from the row projectors themselves — the Dirac analysis gives **tower = 8, all second-class, DOF = 2, at every momentum tested** (axes, face and body diagonals, four random directions). The anisotropic collapse was the toy K's artifact; the gauge-fixed structure is uniform.

## The consequence: three problems become one

On the second-class surface the reduced dynamics is the dark-sector flow: ω² = S_TT·q². So the entire remaining difference between this sector and gauge-fixed Fierz–Pauli is **the one number n202 already mapped: S_TT/S_watch = c_g²/c² ≈ 0.85 (best complex) — not 1.** Construction 2 (the speed) and construction 3 (the canonical structure) have merged: the canonical structure now *matches* gauge-fixed FP, and the dynamics on it differs by exactly the speed deficit. The sector lives or dies on whether the preregistered dressed-vacuum computation closes 0.85 → 1. Nothing else is left in the way — and nothing else can save it.

## What this does and does not rescue

- n212's adverse verdict **stands** against the symmetry reading; n197's covariant 10−4−4 claim stays dead. What is rescued is the *possibility* of GR-equivalence, in fixed gauge, pending the speed.
- h₀₀/h₀ᵢ remain absent as dynamical fields; in the gauge-fixed frame they are determined quantities, not multipliers — the ADM door is superseded, not completed. The full leg-3 comparison (quadratic action term-by-term, in the gauge) is still owed.
- A flag worth registering [C]: in ordinary theory a gauge choice is unphysical; here the "choice" is enacted by a physical monitor. If the audit exists, its gauge is in principle *preferred* — the frame-effects analysis (n139 static; the dynamical version is FP-gate leg 7) becomes load-bearing for this reframe.

**Class: Dirac computation [A-model, exact]; the gauge-fixing reframe [B]; the merge-to-one-number statement [A given n202's map]. The preregistered dressed-vacuum speed computation is now, formally, the whole radiative question.**