# 490d Mirror checkpoint after C328

24 September2026. **C328 complete; C329 unexecuted.** 5 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

Four existing MT contexts give same-role shifts650,590,520,460 and Noah950 residuals300,360,430,490. The selected490 is exact but context-dependent. C327 is recovered as theON/60slice.

The **490-year residual is specific to the restored Cainan-ON/Terah+60 MT context** within the four-state menu tested. The other three admitted contexts preserve the same biographies while producing different cross-context residuals.

SP remains OFF/Terah0 primary, with full430 held in both traditions. Every MT endpoint is retrieved from the existing C286 register, without generating a new context. For Cainan switch c and Terah switch t, the same-role difference is delta=650−130c−60t. These are the regular 130 and 60 context shifts; no cumulative460 insertion is applied.

| MT Cainan / Terah | SP−MT delta | d500 residual | d600 residual | Noah950 residual | d1100 residual | Positive rows /75 |
|---|---:|---:|---:|---:|---:|---:|
| OFF /0 | 650 | −150 | −50 | 300 | 450 | 6 |
| OFF /60 | 590 | −90 | 10 | 360 | 510 | 12 |
| ON /0 | 520 | −20 | 80 | 430 | 580 | 12 |
| ON /60 | 460 | 40 | 140 | 490 | 640 | 18 |

All 60 source endpoint pairs preserve the complete biography gaps 500,100,350,150. The census retains 300 annual ordered-pair comparisons and 2400 independent phase triples, with 600 exact partitions and 96 positive exact partitions. No annual residual is zero. The ON/60 slice reproduces every C327 annual and phase condition.

The Noah950 remainder progresses 300→360→430→490 as the two admitted switches vary. The familiar values in that sequence are recorded as exact residuals; their scalar familiarity does not supply a source selector. Likewise, only ON/60 places the MT counterpart inside the existing500 intervals, but selecting it because a positive40 is desired would restate the chosen target rather than independently justify the context.

This controls the scope of C327's positive490 finding. It does not discard the selected restored context or the other three contexts, merge them into one witness, or establish their statistical independence. The same-Gear500 binding is still held; the source's separate502 binding has not yet been substituted into this census.


## Retained context

C323 remains the completed predecessor synthesis. Retain the six-coordinate OFF600 rectangle family and three nativeON/restored-MT primary counterparts; the full same-Gear Noah-bound SP→MT biography translates by460, with source textual502 a distinct binding. C314 reversal requires i+j=10 and opposite cumulative phases. C313/C315 same-ancestry500/600 failures remain. C287 full domain is i2…5. The paired+2 choices produce its all-K form, but the00 control also retains two17K paths. The optional combined support criteria alone isolate i=j5. No source-prescribed selector has been established. Corrected LXX8464 supplement remains awareness only (1564→1700;2484→2700;920→1000); AD3746/2300 is superseded. Earlier reports, original unprefixed reports and Engine series 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

209 main checks and 15 frozen-input/predecessor authentication checks passed. A second main replay produced byte-identical DATA/RESULTS. Independent review and its scope are recorded in the evidence. All frozen originals and standing controls remain unchanged. Verification counts are not independent-witness counts.

## Best next bounded step

C329: Compare the two explicitly source-qualified G2 Noah/Flood bindings with G2 Shem (500/100) and G1 Shem (502/98), in both held SP and restored-MT contexts. Which residuals survive the binding change?

The context test held500 fixed. The source preserves502 as a different valid binding, so the next bounded control should determine which new residual claims depend on500 and which remain stable under that explicit alternative.

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