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.

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.