# C276 author consistency review

24 September 2026. This is an author mathematical/source review, not a new independent-agent review.

The exact verifier passes 70 checks. A second execution gives six byte-identical generated readouts. No historical campaign was rerun.

The review confirms:

- The frozen rectangle is source-qualified. The 598 span connects Shem index 7 to Flood index 5; the 600 span connects matched index 7. The reflected regular 598 comparison uses G3 Flood and G2 primary Noah, while 600 uses G3 on both ends.
- Selected C127 edges are duration edges. L=−5283 has no stored C127 node; the L-to-N route is inherited from C254 as preserved in C269.
- Source correspondence and transport determine α and β in terms of f and h but do not fix δ=h−f. The two null directions explicitly change δ while preserving the transport equations.
- X is an explicit image-alignment requirement. It has residual δ−598 and adds one independent row. The common-translation null direction survives.
- The six equivalent descriptions of X are one condition. They are not six independent sources of support.
- In the aligned family the images are p, −p and p+2. The selected radius is |p+1|, not universally six or necessarily outer.
- The ±1/4 source components satisfy both routes exactly. The negative-slope branch reverses order; no seasonal reattachment is performed.
- The 7K Noah subtraction and the numeric 5750/6250 bracket require retained absolute placement in addition to the relative increment.
- C270's fixed intercepts contain the original 5290/5888 placement and cannot independently establish it.
- The unreduced MT join is 2m+δ=11178. Its δ=598 reduction cannot independently establish 598. Neither join is imposed in the source-only or aligned cases.
- The fixed-J₁ C271 results remain baseline results. They are not extended to free δ. No claim of all-profile necessity or new chronological states is made.
- The corrected LXX 8464 observation is carried as a supplement; no equation from it enters C276.

The machine checks establish source hashes, retained coordinates and exact arithmetic within the declared model. The distinction between a source duration and a required alignment is the author's interpretation of the explicit premise set. This step does not establish historical necessity for X or prove that support is absent elsewhere.

All sixteen original dependencies and four standing controls remain unchanged. No canonical source, graph, primer, global axis or z-law was modified. C277 is a proposal only.