{"id": "c300", "title": "Limits of the cross-bridge biography extension", "filename": "490d_C300_Cross_Bridge_Biography_Role_Census_20260924.md", "role": "Research action", "step": 300, "sha256": "8940c55492d9e923961b54e34927f1086b80efde20e10cb5668d785f265409b9", "bytes": 2403, "origins": ["C01–C479/packets/C300/490d_C300_Cross_Bridge_Biography_Role_Census_20260924.md"], "download": "/sources/8940c55492d9e923961b54e34927f1086b80efde20e10cb5668d785f265409b9.md", "format": "md", "derived": false, "tags": ["Regular", "Cumulative"], "excerpt": "C300 — The cross-bridge biography role census\n\n24 September2026. Tests the fixed2832 source relation beyond the successful600 segment.\n\nThe MT extension stops at Noah birth and the Flood boundaries. It does not identify the other life endpoints with the held cumulative fields. Twelve labeled hits cover nine of the eigh", "content": "# C300 — The cross-bridge biography role census\n\n24 September2026. Tests the fixed2832 source relation beyond the successful600 segment.\n\n**The MT extension stops at Noah birth and the Flood boundaries. It does not identify the other life endpoints with the held cumulative fields.** Twelve labeled hits cover nine of the eighteen regular MT endpoint records.\n\nThe cumulative domain has72 annual records: Noah, Shem and Flood in each of the three retained profiles. Forward and reflected C266 displays are deduplicated by source identity. Noah fields are explicitly derived as the950-year sequential predecessor of the retained Shem fields; the MT ON opening6846 and LXX native opening7300 are checked against the supplied sources. This derivation assigns no Gear to cumulative chronology.\n\nAll eighteen regular MT Noah/Shem/Flood records are compared by C=B+2832. The resulting1296 comparisons give:\n\n|Regular endpoint role|Labeled hits|Numerical source comparisons|\n|---|---:|---:|\n|Noah birth|4|3|\n|Flood start/close|8|6|\n|Noah death|0|0|\n|Shem birth/death|0|0|\n\nAt normal G2, the required cumulative bases for Shem birth, Noah death and Shem death would be5390,4940 and4790. They are absent from this declared72-record domain. They remain generated requirements; the census does not claim absence from every possible project context.\n\nNo cumulative Noah field member has a matching regular endpoint here. The supported600-year correspondence changes roles from regular Noah/Flood to cumulative Shem/Flood. It is therefore a partial segment correspondence, not an isomorphism of whole named biographies.\n\nThe950-year Noah lifespan remains intact in both chronologies. What fails is the availability of both needed cumulative endpoints under this particular offset and anchor selection, not the lifespan arithmetic. No role, source date or frame is changed to repair the extension.\n\nEight mathematical/domain checks and nine authentication checks pass; the complete source register, required coordinates, matches and failures replay identically. Author review only; no canonical change.\n\n**Best next bounded step — C301:** hold the cumulative fields and2832 relation fixed, and broaden the regular side to the already verified528 Noah/Shem/Flood context records. Determine whether other qualified600-year biographies participate, without adding events or choosing new anchors. High is sufficient.\n"}