# 490d C445–C469 reading index

25 September 2026 UTC. **All25 authorized steps and75 individual deliverables are complete. C470 is unexecuted.**

Read the C469 synthesis and checkpoint first. The C469 compact restart kit is the active packet; the C445–C469 continuation archive preserves all full calculations and published deliverables. Older archives remain selective references, and current source/scope decisions override historical next-step text.

The principal positive result is the complete sourced interval ladder1058→1150→1250 underE3620 thenE2756, with pairs2148/3206→2020/3170→1956/3206. The other transported2K seed forms a253→275 translated configuration with it. The batch also establishes finite operator exclusions, source-anchor dependencies and fixed-Mirror phase limits.

| Step | Report | Checkpoint | Evidence |
|---|---|---|---|
| C445 | [490d_C445_Fixed_Reflection_Composition_Census_20260925.md](sandbox:/workspace/scratch/2cd312e78692/deliverables/490d_C445_Fixed_Reflection_Composition_Census_20260925.md) | [490d_Mirror_Checkpoint_After_C445_20260925.md](sandbox:/workspace/scratch/2cd312e78692/deliverables/490d_Mirror_Checkpoint_After_C445_20260925.md) | [490d_C445_Evidence_20260925.zip](sandbox:/workspace/scratch/2cd312e78692/deliverables/490d_C445_Evidence_20260925.zip) |
| C446 | [490d_C446_Complete_Finite_Reflection_Reachability_20260925.md](sandbox:/workspace/scratch/2cd312e78692/deliverables/490d_C446_Complete_Finite_Reflection_Reachability_20260925.md) | [490d_Mirror_Checkpoint_After_C446_20260925.md](sandbox:/workspace/scratch/2cd312e78692/deliverables/490d_Mirror_Checkpoint_After_C446_20260925.md) | [490d_C446_Evidence_20260925.zip](sandbox:/workspace/scratch/2cd312e78692/deliverables/490d_C446_Evidence_20260925.zip) |
| C447 | [490d_C447_All_Word_529_Exclusion_and_E_Path_Boundary_20260925.md](sandbox:/workspace/scratch/2cd312e78692/deliverables/490d_C447_All_Word_529_Exclusion_and_E_Path_Boundary_20260925.md) | [490d_Mirror_Checkpoint_After_C447_20260925.md](sandbox:/workspace/scratch/2cd312e78692/deliverables/490d_Mirror_Checkpoint_After_C447_20260925.md) | [490d_C447_Evidence_20260925.zip](sandbox:/workspace/scratch/2cd312e78692/deliverables/490d_C447_Evidence_20260925.zip) |
| C448 | [490d_C448_Reflection_Cycle_Identity_and_Fixed_Point_Returns_20260925.md](sandbox:/workspace/scratch/2cd312e78692/deliverables/490d_C448_Reflection_Cycle_Identity_and_Fixed_Point_Returns_20260925.md) | [490d_Mirror_Checkpoint_After_C448_20260925.md](sandbox:/workspace/scratch/2cd312e78692/deliverables/490d_Mirror_Checkpoint_After_C448_20260925.md) | [490d_C448_Evidence_20260925.zip](sandbox:/workspace/scratch/2cd312e78692/deliverables/490d_C448_Evidence_20260925.zip) |
| C449 | [490d_C449_Four_Center_Identity_Source_Domain_20260925.md](sandbox:/workspace/scratch/2cd312e78692/deliverables/490d_C449_Four_Center_Identity_Source_Domain_20260925.md) | [490d_Mirror_Checkpoint_After_C449_20260925.md](sandbox:/workspace/scratch/2cd312e78692/deliverables/490d_Mirror_Checkpoint_After_C449_20260925.md) | [490d_C449_Evidence_20260925.zip](sandbox:/workspace/scratch/2cd312e78692/deliverables/490d_C449_Evidence_20260925.zip) |
| C450 | [490d_C450_Eight_Pivot_E_Arrow_Census_20260925.md](sandbox:/workspace/scratch/2cd312e78692/deliverables/490d_C450_Eight_Pivot_E_Arrow_Census_20260925.md) | [490d_Mirror_Checkpoint_After_C450_20260925.md](sandbox:/workspace/scratch/2cd312e78692/deliverables/490d_Mirror_Checkpoint_After_C450_20260925.md) | [490d_C450_Evidence_20260925.zip](sandbox:/workspace/scratch/2cd312e78692/deliverables/490d_C450_Evidence_20260925.zip) |
| C451 | [490d_C451_Mixed_E_Reflection_All_Word_Closure_20260925.md](sandbox:/workspace/scratch/2cd312e78692/deliverables/490d_C451_Mixed_E_Reflection_All_Word_Closure_20260925.md) | [490d_Mirror_Checkpoint_After_C451_20260925.md](sandbox:/workspace/scratch/2cd312e78692/deliverables/490d_Mirror_Checkpoint_After_C451_20260925.md) | [490d_C451_Evidence_20260925.zip](sandbox:/workspace/scratch/2cd312e78692/deliverables/490d_C451_Evidence_20260925.zip) |
| C452 | [490d_C452_Mixed_Cycle_23_Gaps_and_529_Denominator_20260925.md](sandbox:/workspace/scratch/2cd312e78692/deliverables/490d_C452_Mixed_Cycle_23_Gaps_and_529_Denominator_20260925.md) | [490d_Mirror_Checkpoint_After_C452_20260925.md](sandbox:/workspace/scratch/2cd312e78692/deliverables/490d_Mirror_Checkpoint_After_C452_20260925.md) | [490d_C452_Evidence_20260925.zip](sandbox:/workspace/scratch/2cd312e78692/deliverables/490d_C452_Evidence_20260925.zip) |
| C453 | [490d_C453_Source_State_23_Residual_Census_20260925.md](sandbox:/workspace/scratch/2cd312e78692/deliverables/490d_C453_Source_State_23_Residual_Census_20260925.md) | [490d_Mirror_Checkpoint_After_C453_20260925.md](sandbox:/workspace/scratch/2cd312e78692/deliverables/490d_Mirror_Checkpoint_After_C453_20260925.md) | [490d_C453_Evidence_20260925.zip](sandbox:/workspace/scratch/2cd312e78692/deliverables/490d_C453_Evidence_20260925.zip) |
| C454 | [490d_C454_Direct_529_Source_Pairs_and_Disconnected_Operators_20260925.md](sandbox:/workspace/scratch/2cd312e78692/deliverables/490d_C454_Direct_529_Source_Pairs_and_Disconnected_Operators_20260925.md) | [490d_Mirror_Checkpoint_After_C454_20260925.md](sandbox:/workspace/scratch/2cd312e78692/deliverables/490d_Mirror_Checkpoint_After_C454_20260925.md) | [490d_C454_Evidence_20260925.zip](sandbox:/workspace/scratch/2cd312e78692/deliverables/490d_C454_Evidence_20260925.zip) |
| C455 | [490d_C455_Two_E_Effective_Pivot_and_529_Gap_Census_20260925.md](sandbox:/workspace/scratch/2cd312e78692/deliverables/490d_C455_Two_E_Effective_Pivot_and_529_Gap_Census_20260925.md) | [490d_Mirror_Checkpoint_After_C455_20260925.md](sandbox:/workspace/scratch/2cd312e78692/deliverables/490d_Mirror_Checkpoint_After_C455_20260925.md) | [490d_C455_Evidence_20260925.zip](sandbox:/workspace/scratch/2cd312e78692/deliverables/490d_C455_Evidence_20260925.zip) |
| C456 | [490d_C456_E_Square_Integrality_and_Source_Gates_20260925.md](sandbox:/workspace/scratch/2cd312e78692/deliverables/490d_C456_E_Square_Integrality_and_Source_Gates_20260925.md) | [490d_Mirror_Checkpoint_After_C456_20260925.md](sandbox:/workspace/scratch/2cd312e78692/deliverables/490d_Mirror_Checkpoint_After_C456_20260925.md) | [490d_C456_Evidence_20260925.zip](sandbox:/workspace/scratch/2cd312e78692/deliverables/490d_C456_Evidence_20260925.zip) |
| C457 | [490d_C457_Complete_Shared_Word_529_Interval_Transport_20260925.md](sandbox:/workspace/scratch/2cd312e78692/deliverables/490d_C457_Complete_Shared_Word_529_Interval_Transport_20260925.md) | [490d_Mirror_Checkpoint_After_C457_20260925.md](sandbox:/workspace/scratch/2cd312e78692/deliverables/490d_Mirror_Checkpoint_After_C457_20260925.md) | [490d_C457_Evidence_20260925.zip](sandbox:/workspace/scratch/2cd312e78692/deliverables/490d_C457_Evidence_20260925.zip) |
| C458 | [490d_C458_Source_Basis_of_1058_1150_1250_Ladders_20260925.md](sandbox:/workspace/scratch/2cd312e78692/deliverables/490d_C458_Source_Basis_of_1058_1150_1250_Ladders_20260925.md) | [490d_Mirror_Checkpoint_After_C458_20260925.md](sandbox:/workspace/scratch/2cd312e78692/deliverables/490d_Mirror_Checkpoint_After_C458_20260925.md) | [490d_C458_Evidence_20260925.zip](sandbox:/workspace/scratch/2cd312e78692/deliverables/490d_C458_Evidence_20260925.zip) |
| C459 | [490d_C459_Two_2K_Seeds_as_One_23_Unit_Configuration_20260925.md](sandbox:/workspace/scratch/2cd312e78692/deliverables/490d_C459_Two_2K_Seeds_as_One_23_Unit_Configuration_20260925.md) | [490d_Mirror_Checkpoint_After_C459_20260925.md](sandbox:/workspace/scratch/2cd312e78692/deliverables/490d_Mirror_Checkpoint_After_C459_20260925.md) | [490d_C459_Evidence_20260925.zip](sandbox:/workspace/scratch/2cd312e78692/deliverables/490d_C459_Evidence_20260925.zip) |
| C460 | [490d_C460_Residue_Selection_of_the_Complete_2K_Ladder_20260925.md](sandbox:/workspace/scratch/2cd312e78692/deliverables/490d_C460_Residue_Selection_of_the_Complete_2K_Ladder_20260925.md) | [490d_Mirror_Checkpoint_After_C460_20260925.md](sandbox:/workspace/scratch/2cd312e78692/deliverables/490d_Mirror_Checkpoint_After_C460_20260925.md) | [490d_C460_Evidence_20260925.zip](sandbox:/workspace/scratch/2cd312e78692/deliverables/490d_C460_Evidence_20260925.zip) |
| C461 | [490d_C461_Fixed_Mirror_Images_of_All_529_Source_Pairs_20260925.md](sandbox:/workspace/scratch/2cd312e78692/deliverables/490d_C461_Fixed_Mirror_Images_of_All_529_Source_Pairs_20260925.md) | [490d_Mirror_Checkpoint_After_C461_20260925.md](sandbox:/workspace/scratch/2cd312e78692/deliverables/490d_Mirror_Checkpoint_After_C461_20260925.md) | [490d_C461_Evidence_20260925.zip](sandbox:/workspace/scratch/2cd312e78692/deliverables/490d_C461_Evidence_20260925.zip) |
| C462 | [490d_C462_Mirror_Phase_Ancestry_and_17K_Condition_20260925.md](sandbox:/workspace/scratch/2cd312e78692/deliverables/490d_C462_Mirror_Phase_Ancestry_and_17K_Condition_20260925.md) | [490d_Mirror_Checkpoint_After_C462_20260925.md](sandbox:/workspace/scratch/2cd312e78692/deliverables/490d_Mirror_Checkpoint_After_C462_20260925.md) | [490d_C462_Evidence_20260925.zip](sandbox:/workspace/scratch/2cd312e78692/deliverables/490d_C462_Evidence_20260925.zip) |
| C463 | [490d_C463_Mirror_Conjugacy_With_Anchor_Source_Gates_20260925.md](sandbox:/workspace/scratch/2cd312e78692/deliverables/490d_C463_Mirror_Conjugacy_With_Anchor_Source_Gates_20260925.md) | [490d_Mirror_Checkpoint_After_C463_20260925.md](sandbox:/workspace/scratch/2cd312e78692/deliverables/490d_Mirror_Checkpoint_After_C463_20260925.md) | [490d_C463_Evidence_20260925.zip](sandbox:/workspace/scratch/2cd312e78692/deliverables/490d_C463_Evidence_20260925.zip) |
| C464 | [490d_C464_Essential_SP_Companion_Anchors_and_Source_Sensitivity_20260925.md](sandbox:/workspace/scratch/2cd312e78692/deliverables/490d_C464_Essential_SP_Companion_Anchors_and_Source_Sensitivity_20260925.md) | [490d_Mirror_Checkpoint_After_C464_20260925.md](sandbox:/workspace/scratch/2cd312e78692/deliverables/490d_Mirror_Checkpoint_After_C464_20260925.md) | [490d_C464_Evidence_20260925.zip](sandbox:/workspace/scratch/2cd312e78692/deliverables/490d_C464_Evidence_20260925.zip) |
| C465 | [490d_C465_LXX_Off_Aliases_and_Stable_Source_Support_20260925.md](sandbox:/workspace/scratch/2cd312e78692/deliverables/490d_C465_LXX_Off_Aliases_and_Stable_Source_Support_20260925.md) | [490d_Mirror_Checkpoint_After_C465_20260925.md](sandbox:/workspace/scratch/2cd312e78692/deliverables/490d_Mirror_Checkpoint_After_C465_20260925.md) | [490d_C465_Evidence_20260925.zip](sandbox:/workspace/scratch/2cd312e78692/deliverables/490d_C465_Evidence_20260925.zip) |
| C466 | [490d_C466_Seven_Coordinate_MT_SP_Witness_Certificate_20260925.md](sandbox:/workspace/scratch/2cd312e78692/deliverables/490d_C466_Seven_Coordinate_MT_SP_Witness_Certificate_20260925.md) | [490d_Mirror_Checkpoint_After_C466_20260925.md](sandbox:/workspace/scratch/2cd312e78692/deliverables/490d_Mirror_Checkpoint_After_C466_20260925.md) | [490d_C466_Evidence_20260925.zip](sandbox:/workspace/scratch/2cd312e78692/deliverables/490d_C466_Evidence_20260925.zip) |
| C467 | [490d_C467_Minimal_Operator_Support_and_Deletion_Controls_20260925.md](sandbox:/workspace/scratch/2cd312e78692/deliverables/490d_C467_Minimal_Operator_Support_and_Deletion_Controls_20260925.md) | [490d_Mirror_Checkpoint_After_C467_20260925.md](sandbox:/workspace/scratch/2cd312e78692/deliverables/490d_Mirror_Checkpoint_After_C467_20260925.md) | [490d_C467_Evidence_20260925.zip](sandbox:/workspace/scratch/2cd312e78692/deliverables/490d_C467_Evidence_20260925.zip) |
| C468 | [490d_C468_Alternate_Method_Source_Arithmetic_and_Closure_Verification_20260925.md](sandbox:/workspace/scratch/2cd312e78692/deliverables/490d_C468_Alternate_Method_Source_Arithmetic_and_Closure_Verification_20260925.md) | [490d_Mirror_Checkpoint_After_C468_20260925.md](sandbox:/workspace/scratch/2cd312e78692/deliverables/490d_Mirror_Checkpoint_After_C468_20260925.md) | [490d_C468_Evidence_20260925.zip](sandbox:/workspace/scratch/2cd312e78692/deliverables/490d_C468_Evidence_20260925.zip) |
| C469 | [490d_C469_Sourced_2K_Interval_Ladders_and_Mirror_Boundaries_Synthesis_20260925.md](sandbox:/workspace/scratch/2cd312e78692/deliverables/490d_C469_Sourced_2K_Interval_Ladders_and_Mirror_Boundaries_Synthesis_20260925.md) | [490d_Mirror_Checkpoint_After_C469_20260925.md](sandbox:/workspace/scratch/2cd312e78692/deliverables/490d_Mirror_Checkpoint_After_C469_20260925.md) | [490d_C469_Evidence_20260925.zip](sandbox:/workspace/scratch/2cd312e78692/deliverables/490d_C469_Evidence_20260925.zip) |

## Result locator

**C445 — Ordered Compositions of the Four Fixed Local Reflections.** All 5,968 ordered two-reflection trials give 330 complete paths: 208 zero-shift returns and 122 nonzero paths. Sourced shifts are ±4 (48 each), ±120 (5 each) and ±124 (8 each); both ±116 have zero complete paths.

**C446 — Finite Reachability Under the Four Fixed Reflections.** The four-reflection graph has 373 vertices, 106 edges including four loops, and 272 components. Its 152 active coordinates form 49 nontrivial components plus two loop-only singletons; 221 coordinates have no admitted reflection. The largest components have six coordinates and the maximum shortest-path distance is four.

**C447 — All-Word 529 Test and Established-Path Connectivity.** No nonzero multiple of 529 occurs among all 191 reflection-reachable coordinate pairs. The nonzero E-path coordinates 2148, 2020 and 1956 are reflection-isolated. The source pivots 3620/2756 share a four-point component; 3206/3170 share a different four-point component; midpoint3188 is a loop-only singleton.

**C448 — Cycle Words and Fixed-Point Returns.** The reflection graph has one ordinary simple cycle, 2610→3766→2730→3770→2610, through centers3188,3248,3250,3190. Its four-reflection affine word is the identity because3188+3250=3248+3190. The other four cycles are single-center fixed-point loops, not identity maps.

**C449 — Source Domain of the Four-Center Identity.** All 8,952 four-distinct-center trials produce exactly eight complete words, all returns: the two directions and four starts of one cycle. Each of the eight identity orders has only one sourced input. The cycle has eight source-label assignments and none keeps one unchanged source context.

**C450 — Primitive E Arrows at the Eight Existing Pivots.** The eight existing pivots yield37 sourced E arrows in2,984 trials: eight pivot self-arrows and29 distinct nonzero arrows. Another2,854 outputs are fractional and93 are integer coordinates absent from the frozen register.

**C451 — Complete Directed E and Reflection Reachability.** The combined fixed E/reflection graph has245 operator-labelled arrows and522 reachable directed distinct pairs,140 beyond reflection-only reachability. None has a nonzero529-multiple gap. One merged strong component has eight coordinates; all other strong components retain the reflection partition.

**C452 — Source and Affine Structure of the Unique Mixed Feedback Component.** The only enlarged strong component joins two former reflection components. Its unique simple E-bearing directed cycle is2731→3765→2735→2733→2731. The two E legs each expand a signed−23 pivot gap to−25, moving the Noah-death coordinate down one Gear. The full word fixes2731 with slope625/529 and is not an identity.

**C453 — The 23-Year Source-State Residual and One-Gear E Arrows.** The residual215−130−60−2=23 generates88 same-role source-label E templates, representing64 distinct coordinate arrows. Five label templates realize three of the four one-Gear arrows at the fixed pivots. The remaining arrow is MTNoah2841→2843 about2818, explained by950−650−215−60−2=23.

**C454 — Direct 529 Pairs Versus Operator Reachability.** The frozen register contains60 direct nonzero529-multiple coordinate pairs:34 at529 and26 at1058, with119 labelled source assignments. No pair is connected in either direction by the fixed mixed E/reflection menu. Thus the graph exclusion does not mean the source register lacks529 spans.

**C455 — Two-E Effective Pivots and Sourced 529 Input Gaps.** Across23,872 input/word trials,64 ordered E pairs yield15 complete paths. Thirteen words have a sourced effective fixed point;11 complete paths use one. The only nonzero529-multiple input gap is the established1058 gap atH3206, with2148→2020→1956. Four additional paths have rational, unsourced effective pivots.

**C456 — E-Square Integrality and Source Admission Gates.** For integer input and effective pivot, a two-E output is integral exactly when the input gap is divisible by529. The13 sourced-pivot words have17 integer-output cases,15 sourced outputs and11 complete paths. Among nonzero gaps the gates narrow4→2→1; only2148→2020→1956 survives.

**C457 — Shared-Word Transport of Actual 529 Source Intervals.** Complete shared-word closure of all60 sourced529/1058 pairs reaches63 pairs in756 trials. Only two seeds move:1895/2953→1745/2895 and2148/3206→2020/3170, both1058→1150 underE3620. Only the latter continues, to1956/3206 with span1250 underE2756. No reflection or further E step is admitted.

**C458 — Source Equations for the Two 2K Interval Ladders.** Both admitted2K ladders resolve exactly into source terms. Their input gaps are350+650+60−2 and600+650−130−60−2, each1058. Both first output gaps are500+650=1150; the complete second output is600+650=1250. Eleven required coordinates have16 retained source records.

**C459 — The Shared 23-Unit Configuration of the Two 2K Seeds.** The two transported2K seeds are translated rows of one sourced configuration underE3620: input separation253=11×23 expands to275=11×25. Both input spans are46×23=1058 and both output spans46×25=1150. No other fixed pivot supports a529-multiple input pair.

**C460 — Modulo-23 Selection of the Unique Second Expansion.** Of16 possible second E applications to the two1150 intervals, exactly one has integer outputs and it is fully sourced:2020/3170→1956/3206 about2756. The rows have residues20 and19 modulo23; the eight fixed pivots include residue19 only at2756 and no residue20.

**C461 — Fixed Mirror Images of the Complete 529 Pair Inventory.** The120 fixed-Mirror pair trials yield five complete images, all2K intervals: four atA−2639 and one atA−2635. Exactly two have17K cross-spans, reproducing2648/3706↔−6345/−5287 and2650/3708↔−6343/−5285. The other three have8991,8995 and8997 cross-spans.

**C462 — Inherited Annual Rows and the 17K Cross-Span Condition.** C287 already records four complete17K annual rows, with exchange constants−2641,−2639,−2637 and−2635. The active two-constant test preserves exactly thei3 andi5 assignments. Its three other sourced images reassign annual slots and change the cross-span by−2,+2 or+4; none is a new17K corner.

**C463 — Source-Qualified Mirror Conjugacy of the Mixed Operator Menu.** Across490 fixed-Mirror conjugacy trials, seven arrows have sourced cumulative endpoints but only six also have sourced anchors. All six are reflections: four fixed loops and the two directions of one four-year comparison. The sole E endpoint image,−6344→−6346, requires absent pivot−6321, so no E arrow is fully sourced in this cumulative menu.

**C464 — SP-Companion Dependence of the Positive Witnesses.** Removing SP-companion labels leaves432 records at282 coordinates and34 direct529/1058 pairs, but no shared-word transport. Both2K ladders lose only pivot3620 while retaining every endpoint. The ordinary reflection cycle loses2730; the mixed E cycle loses3765. The two inherited primary Mirror corner controls retain all regular endpoints.

**C465 — LXX-OFF Alias Dependence Versus Coordinate Dependence.** Removing72 theoretical LXX-OFF labels leaves456 labels at all373 coordinates. All245 operator arrows and all60 direct529 pairs survive; labelled529 assignments fall119→88. The full two-E ladder retains one complete MT/SP source assignment instead of eight alias combinations. Its source support does not depend solely on LXX-OFF.

**C466 — Seven-Coordinate Source Certificate for the Complete 2K Ladder.** The complete1058→1150→1250 ladder has a seven-coordinate MT/SP provenance certificate. All seven typed source records are regenerated from six controlling source excerpts. Endpoint equations determine the pivots uniquely as3620 and2756; the SP-companion and primary-death qualifications are explicit.

**C467 — Operator Dependence of the Interval Ladder and Local Cycles.** The complete interval ladder depends only on E3620 andE2756 among the12 tested operators. Deleting3620 removes all529-pair transport; deleting2756 retains the two first expansions but removes continuation. Each reflection can be removed without changing interval transport. The ordinary and mixed cycles have separate, explicitly verified operator dependencies.

**C468 — Alternate-Method Verification of the Finite 529 Findings.** A second implementation passes51 checks and reproduces528 source labels,373 coordinates,330 complete reflection compositions,15 complete two-E paths,60 direct529 pairs,522 mixed reachable pairs with no529 gap, the63-pair shared-word closure with three edges, and all fixed-Mirror image counts. The23 predecessor packets and69 publications pass the sealed integrity audit.

**C469 — Sourced 2K Interval Ladders, Finite Closure and Mirror Boundaries.** C445–C469 are complete. The strongest positive result is the fully sourced common-word interval ladder1058→1150→1250, with endpoint pairs2148/3206→2020/3170→1956/3206 and pivots3620 then2756. A second2K seed shares the first expansion and belongs to the same253→275 translated configuration. The finite mixed graph has no529 endpoint connection; fixed Mirror/phase and source-anchor limits are explicit. C470 remains unexecuted.

## Current clarification

C465’s12→12 mixed-cycle assignment count is for its four listed vertices. Including all required operator anchors gives48→12. C469 freezes that clarification. No coordinate, arrow, cycle or interval result changes.

## Verification and access

All75 individual publications succeeded. The final audit verifies839 packet payloads,300 certificate bindings,514 frozen source entries,25 predecessor links and25 ZIPs. There are45,646 recorded main calculation checks and639 source/authentication checks. The51 alternate-method checks in C468 are included in the main total. These are verification counts, not independent historical witnesses or an independent-agent review.

The compact packet contains C469 in full, C468 in full for alternate-method replay, all23 preceding research reports, and the authenticated C444 evidence ZIP as a baseline reference. C469 freezes all24 predecessor data/results/certificates/next-step decisions. Its sources also preserve File_18, File_09, the C265 checkpoint/certificate, the frozen regular and cumulative registers, C287 controls and the supplemental SKL observation.

The source guards and canonical graph are unchanged. Regular Gears remain Noah/Shem/Flood only. LXX native/OFF labels, SP companions, Flood boundaries and annual cumulative phases remain distinct. The corrected LXX8464 and SKL observations remain supplemental.

## Best next bounded step

**C470, proposed and unexecuted:** Census all existing 1150-year source pairs, test common E transport to 1250 at the same eight fixed pivots, and record which have a complete sourced 2K predecessor. Keep the source register, pivots and phases fixed.

The batch has exhausted common-word transport from actual 529 pairs. The sourced 1150 = 500 + 650 interval is the next natural finite domain: it can distinguish continuations inherited from a complete 2K ladder from other already sourced 1150 intervals. This question has not been executed.