# 490d Mirror checkpoint after C363

24 September 2026. **C363 complete; C364 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

C354–C363 complete. Shem adjacent-Gear598 comparisons admit600 repairs in MT/LXX and both matched SP rails. The retained primary529 side has a continuous two-segment source comparison460+598=1058→500+600=1100, ending at actual SP Shem birth/death. The related Shem rectangle600+50+600=1250 supports a Shem-held squared-E endpoint comparison1058→1250, with an unadmitted intermediate. Three460→500 source placements reduce to650−130−60 and the same lifespan constants. Both new endpoint constructions retain02/22 at i3/i5, so cumulativea remains unselected; separate17K retains22. Source membership and matching inherited phases remain mandatory. No new global operator, source endpoint, coupled prescription or canonical edit.

Latest completed C363; C364 unexecuted and outside the completed authorization. Use the C363 compact kit as active packet, starting with its synthesis/checkpoint; older archives are selective references. Preserve C353458+600 repairs with fixed2K/17K outer endpoints, and C343 primary1058→1150→1250 ladder. New joined map has slopes25/23 then300/299;550/529 is only its total diagnostic ratio. SP Shem birth→death600 and SP/MT offset650 give600+50+600=1250. Shem-held squaredE625/529 reaches existing death endpoints;2056/2058 are generated intermediate coordinates without source membership in the frozen register. Flood-close−500 cannot create MT person companions. Three-row460→500 contexts and six placements share constants and do not supply independent witnesses. Both new source constructions leave02/22:i3/i5; cumulativea stays open. Preserve C287 completei2…5 and C319 fixedi3…7 slice, named500/100 versus502/98 bindings and source-phase ancestry. K529,E25/23,P70/69; File02 gap300/299 is not ResidueProtocol. Global paired MirrorJanuaryAD1, local junctionJanuaryAD2, no yearzero. Regular GearsNoah/Shem/Flood only; SP minus-one person rails local; primary Noah death retains inclusive/harmonic qualification. No new source nodes, phases, fitted anchors, global axes, primers, canonical or graph changes. Corrected LXX8464 observation remains awareness only; AD3746/2300 remains superseded. Original reports, Engine reports and C-series remain distinct; the old incompleteSeptember17 ZIP differs from the subsequently verified intact original.

## Retained context

C353 adds the primary458+600=1058 paired source realization with original2K/17K outer endpoints unchanged, the598→650 SP/MT Shem image under E, and bounded partial relations.600 output alone leaves nine primary controls; both598 inputs select22 conditionally. Whole-affine gap conversion is not biography or seasonal-component transport. 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

76 main checks and 61 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

C364: Test whether the joined460/598→500/600 comparison has a source-qualified cumulative counterpart in the frozen LXX Cainan ON/OFF Shem/Flood annual register. Require actual internal and terminal members and inherited phase ancestry; compare with C351’s existing458+600 repair. Preserve the460 Cainan lifespan and the existing annual-member domain.

The new regular source constructions leave cumulativea unresolved. Testing their cumulative counterpart targets that remaining connection directly and can reuse the existing register and prior exclusions. This is proposed only; authorization ends at C363.

The current authorization ends here. C364 requires a new instruction.