# 490d Mirror checkpoint after C437

25 September 2026 UTC. **C437 complete; C438 unexecuted.** 7 steps remain in the current authorization. Current decisions override archived next-step text.

## Current result

Six derived c=N−518 profiles yield four sourced MT Noah centers3188,3190,3248,3250;3192/3252 require unavailableGear4. Onlyc3188 has all five points c±432,c±18,c. Source offsets are650−215−1−2=432;650−500−130−2=18;650−600−130+60+2=−18;650−950−130−2=−432. The ratio450/414=25/23 follows from432:18=24:1.

## Earlier results in this batch

**C435**: All2238 six-map/input trials yield23 sourced first-leg outputs,10 integer final outputs,8 sourced final outputs and two complete coordinate paths: old2148→2020→1956 and additional3206→3170→3206, both withp3620/q2756. The loop has signed gaps414/−414 and changes36/−36, with SP/LXX-OFF Shem-birth endpoints and SP/LXX-OFF Flood-start intermediate. Its16 Cartesian label assignments are not yet16 same-record returns.

**C436**: The3206→3170→3206 loop has16 Cartesian labels:8 same-record returns and8 SP/LXX alias switches; one all-SP assignment and zero unchanged-context assignments. Source36=100−60−4. Signed gaps414→450 and−414→−450 establish a mixed-direction fixed-point return, not chronological repetition. Both pivot and station pairs share3188, already MT Noah birthG2/C1/T0/F1, with radii432 and18 (ratio24).

## Baseline and standing scope

C434 is the authenticated baseline. Its checkpoint is frozen in sources/C434_CHECKPOINT.md. It derives25(215−130+1)+23×950=48×500, and the six source-pivot comparisons p=N−86, q=N−950, H=N−500. Only G1/T0 has its complete2K path2148→2020→1956. The SKL appendix and corrected LXX8464 observations remain supplemental; no redirection follows. C432’s E excerpt locator was corrected in C434 to File_46 L3, lines117–133; prior arithmetic already used25/23.

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.

## Limits and verification

No new source or global axis is selected. Only four derived centers are admitted as source records; all negative statements concern the frozen finite domain.

28 calculation checks and 18 source/predecessor authentication checks passed. Main result files replay byte for byte. These are root-agent checks, not an independent-agent review or independent historical witnesses.

## Best next bounded step

C438: For the four already sourced centers3188,3190,3248,3250, census the local reflection R_c(x)=2c−x over the373 fixed regular coordinates. Identify the exact source domain and any role/context pairs, keeping these local comparisons distinct from the global Mirror.

The five-point profile supplies source-derived local reflection candidates. A complete fixed-domain census can determine whether they exchange only the known pairs or a wider source pattern.

Continue within the authorized batch and reassess after the next result.