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Deepen engine type parser semantics

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Jan Petykiewicz 2026-04-21 22:44:51 -07:00
commit 1bd4158c0c
7 changed files with 297 additions and 33 deletions
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@ -10,11 +10,10 @@ This file is the short active queue for the current runtime and reverse-engineer
## Current Active Items
- No active repo-local non-dynamic items remain.
The last local static head was the locomotives-page tail, and the checked [locomotive catalog tail census](../artifacts/exports/rt3-1.06/locomotive-catalog-tail-census.json) now exhausts the full local `.gms + .gmx` corpus under `rt3_wineprefix/drive_c`: `29` candidate saves found, `26` parsed samples, `5` catalog-bearing saves, one save-stable ordinal prefix through `58` (`VL80T`), two observed `59+` tail clusters (`g.gms` with `242 A1 / Class 460 / Class A1 / Class P8 / U1`, and the four classic 1.05 saves with `GP 35 / U1 / Zephyr`), zero observed `Class QJ`, and zero packed-event carriers for descriptor `452` or the upper bands `457..474` / `475..502`.
The added `18` `.gmx` sandbox saves widen the local corpus and packed-event coverage, but they still contribute no named locomotive table and no derived `locomotive_catalog`, so they do not move the save-native tail evidence beyond the same five catalog-bearing `.gms` saves.
That means the remaining locomotive questions are no longer repo-local static work. They now require either a broader save corpus or dynamic tracing.
Preserved checked locomotive blocker detail now lives in [Locomotive descriptor tails](rehost-queue/locomotive-descriptor-tails-2026-04-21.md).
- The active static parser head is now the `engine_types` semantics frontier.
The repo now has structural inspectors for `.car`, `.lco`, `.cgo`, and `.cct`, but the binary side is still only partially semantic: the checked 1.05 corpus grounds `.car` fixed strings at `0x0c / 0x48 / 0x84` plus a second fixed stem slot at `0xa2` and a side-view resource name at `0xc0`, while `.lco` carries a stable primary stem at `0x04` and only conditional companion/body slots at `0x0c` and `0x12` when the leading stem slot is padded.
The next honest static work is to keep promoting those fixed lanes into stable parser fields and decide how far `.cgo` and the remaining `EngineTypes` sidecars can be grounded without overclaiming semantics.
Preserved checked parser detail now lives in [EngineTypes parser semantics](rehost-queue/engine-types-parser-semantics-2026-04-21.md).
Preserved checked format inventory detail now lives in [RT3 format inventory](rehost-queue/format-inventory-2026-04-21.md).
## Preserved External And Dynamic Blockers
@ -34,6 +33,7 @@ This file is the short active queue for the current runtime and reverse-engineer
## Preserved Detail
- [Archive snapshot](rehost-queue/archive-2026-04-19.md)
- [EngineTypes parser semantics](rehost-queue/engine-types-parser-semantics-2026-04-21.md)
- [RT3 format inventory](rehost-queue/format-inventory-2026-04-21.md)
- [Locomotive descriptor tails](rehost-queue/locomotive-descriptor-tails-2026-04-21.md)
- [Periodic company control lane](rehost-queue/periodic-company-control-lane-2026-04-21.md)