# 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, with those five exact internal-to-auxiliary pairs now preserved directly in the report surface, 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 in 1.05, but the remaining `13` are the missing `CarSideView_3.imb` cohort and that hole exists in both checked installs, while `43 / 145` derived `{internal_stem}_NE.imb` names resolve and all of those hits belong to matched locomotive pairs. The parser now preserves that `CarSideView_3` miss cohort exactly, and it also preserves the tiny conditional `.lco` companion-profile seam directly: in 1.05 the padded `.lco` companion/body slots collapse to `Zephyr / (none) / CarSideView_3` for `242_a1_l`, `gp35l`, `u1l`, and `zephyrl`, and to `VL80T / Loco / CarSideView_{1,2}` for `be 5-7`, `f3 loco`, and `gp7`. The classic install widens the same `0xc0` seam further: the side-view slot is not only `CarSideView_*` but also a larger unresolved `*_Profile.imb` family, and every checked classic `*_Profile.imb` reference currently misses the packaged `rt3_2IMB.PK4` surface too. The packaged profile metadata is stable enough to summarize: `CarSideView_1` is `512x512` at `0.04` VRAM, `CarSideView_2` is `512x256` at `0.02`, and every packaged `_NE` profile is `512x128` with `HorizontalScaleModifier = 0.75` and `MaxPercentOfInterfaceVRAM = 0.09`. The `_NE` split is now aligned with the locomotive display census too: all `43` packaged `_NE` hits live inside the grounded display prefix, and all `5` unmatched display-tail families are still missing packaged `_NE` profiles. The cargo side is partially linked now as well: the `.cgo` ladder families and `.cct` sidecar identifiers share the same cargo-family keys for ten checked families, with `Troop` left as the only `.cct`-only outlier. The next honest static work is to keep promoting those fixed lanes into stable parser fields, explain the five remaining distinct auxiliary-stem cases, decide whether the classic `*_Profile.imb` side-view references are dead loose-file dependencies or a still-unmapped package family, and decide how far the `.cgo` ladders plus the low-cardinality `.lco` lanes can be grounded without overclaiming semantics. The latest corpus check did narrow one point already: the low-cardinality `.lco` lanes do not split cleanly on `_NE` presence, so that branch now wants binary/code correlation rather than more aggregate-only counting. 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)