# 490d Mirror checkpoint after C353

24 September 2026. **C353 complete; C354 unexecuted.** 0 steps remain in the current authorization. Read this checkpoint and report first; frozen predecessor records retain earlier findings. Current decisions override stale archive instructions. Do not repeat completed research.

## Current result

C344–C353 complete. Primary598→600 has two source repairs: preserving2K gives458+492+108; preserving460/490 gives1060. The cumulative counterpart preserves1058 as458+600 at i2…5, and both primary sides can do so at i3/i5 with all2K/17K outer endpoints fixed. Noah-held E sends the original primary598 interval to an actual SP/MT Shem650 pair. The supported endpoint moves form bounded partial relations; whole-biography and single-physical-time dilation claims fail their stated tests. Both598 inputs select22 primary, but actual600 outcomes leave9 admitted primary controls across allfour choices. No new coupled source prescription.

Latest completed C353; C354 unexecuted and outside the completed authorization. Read C353 synthesis/checkpoint first; compact C353 kit is the active packet and older archives are selective references. Preserve C343 primary1058→1150→1250 ladder and its companion1149/502-mode1152 controls. Preserve C287 full SP i2…5 and C319 i3…7 control slice. The retained MT-companion gap is599, so300/299 gives601+1/299; this finding is limited to those endpoint comparisons. Cumulative458 is a cross-index/Cainan-state leg, never a changed460 lifespan or cumulative Gear. Source gap conversion, Gear translation, center/phase comparison and physical-time affine map stay distinct. K=529,E=25/23,P=70/69;300/299 is the File02 gap ratio and not ResidueProtocol. Global paired MirrorJanuaryAD1; local junctionJanuaryAD2; no civil yearzero. Regular GearsNoah/Shem/Flood only; SP person companion local; SP primary death retains inclusive/harmonic qualification. Capture now; canonize later. No new source node, phase, fitted anchor, global axis, primer, canonical or graph edit. LXX8464 supplement remains awareness only; AD3746/2300 superseded. Earlier incompleteSeptember17 ZIP differs from the later verified intact original. C-series, original unprefixed reports and Engine reports remain distinct.

## Retained context

C343 is the preceding synthesis. The primary Noah-held source ladder1058→1150→1250 under E=25/23 has refinement460+490+108+92+100. Companion actual MT Shem gives1149 and the valid502/98 mode gives1152; both retain double-E outer endpoints. C341 distinguishes component-preserving comparisons from one physical-time affine dilation or a biography-preserving map. C334 shared Shem±2 origin is explicit, but exact cumulative/regular endpoint coupling is unestablished in reviewed passages. C342 full regular ladder leaves C319 controls02 and22 at i3/i5; separate17K selects22. C287 full SP domaini2…5 remains; C319 is onlyi3…7. C314 reversal requiresi+j=10 with opposite cumulative ancestry phase; C323 conditionali=j5 uses its extra support requirements. SP primary death retains inclusive/harmonic qualification; matched lifespan950 remains. Source500/100 and502/98 bindings are valid alternatives. Scalar/C89 prior art remains distinct from the Noah-held endpoint realization. Corrected LXX8464 supplement is awareness only:1564→1700,2484→2700,920→1000; AD3746/2300 superseded. Earlier incompleteSeptember17 ZIP differs from the later verified intact original. Original unprefixed reports, Engine reports and C-series remain distinct. No independent witness or source-prescribed selector is inferred from repeated coordinates.

Mirror/529 focus: K=529, E=25/23, P=70/69. Global paired Mirror January AD1; local junction January AD2; no civil year zero. Regular Gears are Noah/Shem/Flood only. SP minus-one person companions remain local to SP Noah/Shem; Flood close is a separate boundary. No upstream/cumulative Gear, new endpoint or phase, fitted anchor, global axis, primer reopening, canonical or graph edit. Capture now; canonize later. Source identity, context, modal binding, generated coordinates and phase ancestry stay distinct.

## Verification

68 main checks and 57 frozen-input/predecessor authentication checks passed. A second main replay produced byte-identical DATA/RESULTS. These checks and the source interpretation were performed by the root agent; no new independent-agent review is claimed. All frozen originals and standing controls remain unchanged. Verification counts are not independent-witness counts.

## Best next bounded step

C354: Audit the same598→600 comparison on existing adjacent-Gear Shem birth/death pairs in the frozen regular Noah/Shem/Flood register, keeping contexts and matched SP rails explicit. Determine whether any pair connects to the retained529/E endpoint relations; add no source endpoints, phases, anchors or broader Gear scope.

The Noah/Flood gap rule and its cumulative counterpart are now bounded. Shem’s separately sourced600 lifespan offers the next role-qualified comparison, allowing a direct test of structural reuse without repeating the completed Noah/Flood census. This is proposed only; authorization ends at C353.

The current authorization ends here. C354 requires a new instruction.