# Rehost Queue

This file is the short active queue for the current runtime and reverse-engineering frontier.

## Working Rule

- Continue after each commit unless the queue is empty, a real blocker remains, or approval is needed.
- Keep detailed branch notes, long evidence dumps, and retired queue state in `docs/rehost-queue/`.
- Prefer linking to preserved notes instead of growing this file into another worklog.

## Current Active Items

- 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 checked 1.05 corpus now also splits `.car` auxiliary stems into `126` direct matches, `14` role-neutral roots, and only `5` truly distinct cases, while `.cgo` collapses into five stable scalar ladders instead of arbitrary floats.
  The early `.lco` lane block is now partially partitioned too: only offsets `0x20`, `0x34`, `0x38`, `0x3c`, `0x44`, `0x48`, and `0x54` behave like low-cardinality buckets, while the other early lanes still look high-variance.
  The side-view resource path is now grounded into `Data/2D/rt3_2IMB.PK4`, and the `.imb` parser now decodes shipped comment-suffixed numeric rows plus `_NE` profile fields such as `HorizontalScaleModifier` and `ImageWHScaled`.
  The checked PK4 linkage split is now explicit too: `132 / 145` side-view resource names resolve directly, but the remaining `13` are the missing `CarSideView_3.imb` cohort, while `43 / 145` derived `{internal_stem}_NE.imb` names resolve and all of those hits belong to matched locomotive pairs.
  The next honest static work is to keep promoting those fixed lanes into stable parser fields, explain the five remaining distinct auxiliary-stem cases, and decide how far the `.cgo` ladders plus the low-cardinality `.lco` lanes 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

- The locomotives-page tail remains preserved as an external-corpus blocker.
  Static repo-local work on this head is now exhausted: the local `29`-save `.gms + .gmx` census proves the stable prefix through `58`, proves the same two scenario-dependent `59+` tail families, and still finds no `Class QJ` placement plus no descriptor carriers in `452` or `457..502`. The next honest non-hook step requires a broader save corpus; the next non-static step requires dynamic tracing.
  Preserved checked blocker detail now lives in [Locomotive descriptor tails](rehost-queue/locomotive-descriptor-tails-2026-04-21.md).
- The periodic-company control-lane head remains preserved as a dynamic blocker around the ordinary loaded runtime-effect strip `0x00444d92 -> 0x00432f40(kind 8) -> 0x004323a0 -> 0x00431b20`.
  Static progress on this head now appears genuinely blocked: the whole-binary `[...+0x7ef]` reference census still collapses to the grounded writer set plus the already-known compare and copy helpers, so the next honest step likely requires hook-side or runtime tracing between reload `0x00433130` and the world-entry kind-`8` sweep at `0x00444d92`.
  Preserved checked control-lane detail now lives in [Periodic company control lane](rehost-queue/periodic-company-control-lane-2026-04-21.md).
- The Tier-2 building head remains preserved as a dynamic blocker around the seed/projection seam into `0x00412d70`.
  The stock decode chain, the bare-name remap callback, the rebank-or-clone owner, and the earlier suspected mid-range replay strip are all now grounded, so the next honest step likely requires runtime tracing of which source rows actually enter the live bank-qualified seed set.
  Preserved checked row-family detail now lives in [Tier2 candidate row families](rehost-queue/tier2-candidate-row-families-2026-04-21.md).
  Preserved checked stock selector-byte detail now lives in [Tier2 selector-byte sources](rehost-queue/tier2-selector-byte-sources-2026-04-21.md).
  Preserved checked rebuild sequencing detail now lives in [Tier2 rebuild sequencing](rehost-queue/tier2-rebuild-sequencing-2026-04-21.md).

## 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)
- [Tier2 candidate row families](rehost-queue/tier2-candidate-row-families-2026-04-21.md)
- [Tier2 rebuild sequencing](rehost-queue/tier2-rebuild-sequencing-2026-04-21.md)
- [Tier2 selector-byte sources](rehost-queue/tier2-selector-byte-sources-2026-04-21.md)
- [Progress history](history/progress-history.md)