# 490d C311 — Source-rule audit of the MT-to-SP context switch

24 September 2026. One bounded continuation after C310; no C312 execution.

**Result:** File_18, File_09 and the existing axis report support the relevant endpoint states and qualified comparisons. No pre-existing rule was located in these three documents prescribing C310's exact MT Noah/Flood → SP Shem-life switch. C310 remains an exact composite comparison cover; its transition has not been established as a source-prescribed chronology.

This finding limits the claim, not the arithmetic. It does not demonstrate that the cover is invalid or that no selector exists in another dependency.

## The fixed question

C310's unique minimum context-family cover uses the following families. Each segment retains its own Gear and rail labels; one family is not one fixed Gear.

| Regular comparison family | Cainan | Terah | Sojourn | Retained LXX OFF indices |
| --- | --- | --- | --- | --- |
| MT Noah birth → Flood start | OFF | 0 | full 430 | j=0,2 |
| SP Shem birth → Shem death | OFF | +60 | minimum 215 | j=3,4,5,6,7 |
| LXX Shem-life aliases | OFF | +60 | minimum 215 | j=3,5,7; no additional coordinates |

The held cumulative field is `Shem=5890−j`, `Flood=5290−j`, j=0…7. The fixed comparison condition remains `C−B=2832`, from the regular 8464-to-Q6 and cumulative 12696-to-Q1406 constructions. Index j=1 still lacks the required upper regular endpoint 3057; its proposed pair is 3057/2457. C311 did not rerun or enlarge the endpoint census.

The audit separates three propositions: the endpoint/state ingredients are documented; qualified comparisons are permitted; a rule independently prescribes the particular annual-index-dependent selection. Support for the first two does not establish the third.

## What the sources establish

**File_18 supplies the regular ingredients.** Its MT minimum table gives Noah 2843 and Flood start 2243; the full-sojourn adjustment gives the familiar Normal-Gear-2 3058/2458 pair. Its ordinary Flood table explicitly fixes the full430/Terah0 context and names Gear starts 2460, 2458 and 2456. Its SP Noah/Shem table provides primary and local companion biographies; matched Shem birth/death endpoints remain 600 years apart. The shared variant fork and SP Terah discussion support the declared +60 regular state where opened. [F18-04 through F18-08]

The evidence reconstructs all six SP table-derived Shem pairs under +60 and binds the five retained SP cover segments to them. File_18 itself says these are source-controlled stations, **not six independently attested source states**. Their count must not become a count of historical witnesses. [F18-07]

**File_18 permits qualified comparisons while retaining identity controls.** Its source-role statement distinguishes the number source from axiom/entity rule sources. Shared dates or spans do not create identity without matching state, node class, tradition and operator. Its comparison passages support named cross-tradition and Noah/Shem comparisons; they do not assign MT and SP contexts to the C310 indices. [F18-01 through F18-03; F18-07]

**File_09 protects cumulative endpoint roles.** Cumulative Shem is an architecture boundary, not automatically an ordinary birth or death. A regular state cannot replace a cumulative state without the specified conversion/dependency. Its worked cumulative/regular comparisons show how a shared scalar can connect separately labelled endpoints without collapsing them. These rules permit careful comparison; they do not prescribe C310's change of biography, tradition, Terah setting and sojourn frame. Its seven-year anatomy also supplies no index-to-context selector for this cover. [F09-01 through F09-04]

**The axis report supplies fixed comparison algebra and explicitly selected contexts.** Its common translation formula supports the bridge/anchor comparison. Its main ordinary table selects MT Normal Gear 2; its cumulative tables retain full envelopes and fixed anchors. Background SP Gear-1 and sojourn-frame examples remain separately selected constructions. The broader 5+1+1+6 interpretation is retained without claiming a fully assigned continuous chain. None of those passages prescribes this particular switch. [AX-01 through AX-06]

The axis report's narrower main-table Gear choice does not undo the later authorized Noah/Shem/Flood census. Its dependency discipline does, however, prevent treating consequences of selected premises as independent witnesses or giving generated coordinates event identities without a source/template. [AX-03; AX-07]

## Provenance qualification and audit limits

The retained LXX OFF cumulative field is **derived**, not a native row printed verbatim in File_18. Its §6D prints the native Cainan-ON Flood envelope 5750–5743 and does not print a Shem row there. C311 inherits the established C266/C302 derivation rather than redescribing it as direct attestation. The frozen C302 data identifies the audited pairs; C310 supplies their minimum-cover result. [F18-09]

The review used whole-document candidate searches followed by relevant rule, state, table and comparison passages. Twenty bounded excerpts, their exact line spans and hashes, search results, two separate File_18/File_09 review notes and the author's axis review are included in the evidence. Citation IDs refer to `evidence/DATA.json`; source sections are also identified in each review note.

Fifteen automated citation-binding and retained arithmetic/domain assertions passed, with ten source-authentication checks. Two generated outputs replay byte identically. These checks authenticate the frozen inputs and preserve the existing match; **they do not prove textual absence or historical intention**. The source-rule conclusion is a bounded qualitative judgment. Unreviewed dependencies were not searched, and no historical endpoint or global axis claim was added.

## Decision after C311

Preserve C310's exact cover and annotate the transition as **not yet source-prescribed**. Do not merge the cumulative and regular event roles or promote the two contexts to one unchanged chronology. File_18, File_09, the axis source, C265 certificate and C127 graph remain unchanged.

**Best next bounded step — C312, proposed only:** test whether a single source-labelled, same-Gear transport between the already admitted MT Noah→Flood and SP Shem-life 600-year pairs explains their relationship to the existing MT/LXX cumulative weave and its field boundary. Hold endpoints, bridges, anchors and allowed states fixed; test both the SP primary and local companion rails. Require one uniform rule, account for all admitted cases and boundary failures, and do not introduce a selector merely to fit the cover. This tests a constrained structural explanation without claiming it establishes historical selection. High is sufficient. C312 has not been executed.