# 490d Mirror checkpoint after C343

24 September2026. **C343 complete; C344 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

C334–C343 complete. Primary SP Noah paths support a source-qualified Noah-held duration ladder1058→1150→1250 under E=25/23, with refinement460+490+108+92+100. Companions retain the sourced double-E endpoints but their actual MT Shem span is1149; the valid502/98 control gives1152. The full regular ladder does not select cumulative a:02 and22 remain until the separate17K condition. Scalar/C89 prior art, source qualifications and phase/map limits are retained.

Latest completed C343; C344 unexecuted and outside this authorization. Read C343 synthesis/checkpoint first; use the C343 compact restart kit as the active packet and prior archives selectively. Preserve C287 complete SP domaini2…5 and C319 control slicei3…7. Primary ladder holds on i3/i5 and matching inherited components only; no MT person companion or whole-biography dilation. C334 finds shared Shem±2 origin but no exact endpoint coupling prescription in reviewed passages. K=529,E=25/23,P=70/69. Global paired MirrorJanuaryAD1, local junctionJanuaryAD2, no civil yearzero. Regular GearsNoah/Shem/Flood only; SPminus-one persons local. No new source endpoint, phase, fitted anchor, global axis, primer, canonical or graph edit. Corrected LXX8464 supplement remains awareness only; AD3746/2300 superseded. Original unprefixed reports, Engine reports and C-series remain distinct. Earlier incompleteSeptember17 ZIP differs from the later verified intact original.

## Retained context

C333 remains the completed predecessor synthesis. All four C287 SP paths support 2K=1058=950+108 through actual source-qualified SP Noah death. Primary partitions are 460+490+108; companion partitions are 459+491+108 with actual MT Noah. The primary death keeps its inclusive/harmonic qualification. C332 death conditions retain 02 and 22 at i3/i5; adding two17K conditionally selects22. C319's i3…7 control slice does not replace C287's complete i2…5 domain. C314 reversal requires i+j=10 with opposite cumulative ancestry phases; C313/C315 same-ancestry failures remain. C323's optional combined support criteria alone isolate i=j5. Source-explicit local E expansion prescriptions are retained, with no established link to the particular regular SP→MT context translation. Named500/100 and502/98 bindings remain distinct. Repeated source coordinates, phases and verification counts are not independent witnesses. Corrected LXX8464 supplement remains awareness only:1564→1700,2484→2700,920→1000; AD3746/2300 is superseded. The earlier incomplete September17 local ZIP differs from the later verified intact original. C-series, original unprefixed reports and Engine reports remain distinct.

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 56 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

C344: Audit File_02 §6.3’s explicitly prescribed gap conversion598×300/299=600 against the retained adjacent-Gear MT Noah/Flood endpoints. Test the existing held-endpoint realizations and their effect on the Noah-held2K/E ladder, keeping companion and modal states separate. No new endpoints, Gears, phases or anchors.

The present batch separates source choice, coherent Gear movement and E interval matching. The explicit598→600 source rule offers a focused next comparison of those mechanisms without another broad endpoint search. It is proposed only; the ten-step authorization ends at C343.

The current authorization ends here. C344 requires a new instruction.