# 490d Mirror checkpoint after C426

24 September 2026. **C426 complete; C427 unexecuted.** 7 steps remain in the current authorization. Current decisions override old archived instructions. Do not rerun completed research.

## Current result

All46 labelled2K pairs reduce to four context offsets:458 (20 labels/12 coordinates),708 (16/8),1057 (4/2),1059 (6/5). Role and local companion terms complete1058. Their coordinate union has26 rather than27 pairs because3298/2240 belongs to both708 and1057 templates through two distinct MT lower records: Noah deathG3/C1/T0/F1 and Flood closeG1/C0/T0/F0.

## Earlier results in this batch

**C424**: The16 labelled Flood-start/Noah-death2K pairs occupy eight coordinates, with SP/LXX aliases. All768 fixed-context station comparisons yield no additional2K station. Corresponding primary/native person and Flood roles differ708; SP companion person roles differ707. The mixed-role2K matches are separate from the C416 same-role profile.

**C425**: All6912 Flood-start/Noah-death record pairs were tested; exactly16 hits recover C424. Their single source equation is1058=350+650+60−2. Cainan and sojourn settings match, Terah differs+60, upper Gear is one below lower, and lower Noah death is MT. The16 labels are eight coordinate repetitions of one708-context/350-role relation.

## Inherited C423 context — historical next-step wording superseded

Latest completed C423; C424 is unexecuted and outside this completed authorization. Read the C423 synthesis and checkpoint, then the C414–C423 reading index. Use the C423 compact restart kit as the active packet; older archives are selective references. The new2K person profile is SP companion G3 C1/T1/F1 versus MT G1 C0/T0/F0. Keep the four person pairs and the explicit SPclose/MTstart fifth station distinct from a same-boundary Flood-year translation, which fails by one year. C414 is the complete26-pair source census, C415 the record-identity audit, C416 the four-station profile, C417 finite uniqueness, C418 Flood-boundary controls, C419 fixed Mirror failures, C420 the exact3899-held squared-E endpoint, C421 the absent-path proof and C422 direct source/component audit. The profile does not replace original i3/i5 two17K joins. The scalar1058→1250 is prior arithmetic; the new3899/2841/2649 source context is an endpoint comparison with absent2749. Preserve prior C413 source500/Shem-loop results and their limits; no completed research needs rerunning. K529,E25/23,P70/69; J300/299 is File02 gap conversion, not Residue Protocol or general date operator. Global paired Mirror January AD1; local junction January AD2; no civil year zero. Regular Gears Noah/Shem/Flood only. SP person companions remain local; Flood close is independent; SP primary Noah death remains inclusive/harmonic; both500/100 and502/98 modes remain valid. LXX native CainanON is not given a second insertion; OFF is theoretical removal. No new sourcepoint, phase, fitted anchor, global axis, upstream/cumulative Gear, primer reopening or canonical graph edit. Corrected LXX8464 supplement remains awareness only:1564→1700,2484→2700,920→1000; AD3746/2300 superseded. C-series, original unprefixed reports and Engine reports remain distinct. The earlier incomplete September17 local ZIP differs from the later verified intact original. Arithmetic, aliases, repeated paths and alternate implementations are not independent historical witnesses. Proposed C424 is a bounded audit of the16 labelled Flood-start/Noah-death2K pairs already enumerated by C414, checking their exact contexts and any additional station correspondence; it has not been performed.

Mirror/529 focus: K=529, E=25/23, P=70/69; J=300/299 remains File02 gap conversion, not a calendar date operator or Residue Protocol. Regular Gears are Noah/Shem/Flood only. SP person companions are local to Noah/Shem; Flood close is an independent event boundary. Both500/100 and502/98 bindings remain valid; SP primary Noah death retains its inclusive/harmonic qualification. LXX native Cainan is ON; OFF is theoretical removal. Global paired Mirror January AD1; local junction January AD2; no civil year zero. No new source point, phase, fitted axis, upstream/cumulative Gear, primer reopening or canonical/graph edit. Capture now; canonize later. Coordinates, source labels, context aliases and derived comparisons remain distinct. Counts are not independent historical witnesses.

## Verification

575 calculation checks and 14 source/predecessor authentication checks passed. A separate main replay is byte-identical. Root-agent analysis and replay; no new independent-agent review is claimed. Verification counts are not independent historical witnesses.

## Best next bounded step

C427: Resolve the MT Noah-death/Flood-close coincidence responsible for the sole template overlap. Census all such MT record coincidences, retain their separate biographies and event contexts, and check which can actually participate in an existing2K pair.

The four-template reduction exposes one coordinate collision. Resolving its source identity is necessary before interpreting the templates as a connected structure.

Continue within the authorized batch, reassessing after the next result.