Preserve engine type profile cohorts

crates/rrt-runtime/src/inspect/engine_types.rs

@@ -170,10 +170,15 @@ pub struct EngineTypesInspectionReport {
     pub car_side_view_resource_pk4_missing_counts: BTreeMap<String, usize>,
     pub car_auxiliary_stem_counts: BTreeMap<String, usize>,
     pub car_auxiliary_stem_relation_counts: BTreeMap<String, usize>,
+    pub car_auxiliary_stem_distinct_pair_counts: BTreeMap<String, usize>,
     pub internal_ne_profile_pk4_match_count: usize,
     pub internal_ne_profile_pk4_missing_count: usize,
     pub locomotive_pair_internal_ne_profile_pk4_match_count: usize,
     pub locomotive_pair_internal_ne_profile_pk4_missing_count: usize,
+    pub matched_prefix_internal_ne_profile_pk4_match_count: usize,
+    pub matched_prefix_internal_ne_profile_pk4_missing_count: usize,
+    pub unmatched_display_internal_ne_profile_pk4_match_count: usize,
+    pub unmatched_display_internal_ne_profile_pk4_missing_count: usize,
     pub internal_ne_profile_texture_size_counts: BTreeMap<String, usize>,
     pub internal_ne_profile_horizontal_scale_modifier_counts: BTreeMap<String, usize>,
     pub internal_ne_profile_max_percent_of_interface_vram_counts: BTreeMap<String, usize>,
@@ -423,6 +428,11 @@ pub fn inspect_engine_types_dir(
             .iter()
             .filter_map(classify_car_auxiliary_stem_relation),
     );
+    let car_auxiliary_stem_distinct_pair_counts = count_owned_values(
+        family_entries
+            .iter()
+            .filter_map(distinct_car_auxiliary_stem_pair_label),
+    );
     let lco_companion_stem_counts = count_named_values(
         family_entries
             .iter()
@@ -450,6 +460,42 @@ pub fn inspect_engine_types_dir(
                 && family.internal_ne_profile_found_in_pk4 == Some(false)
         })
         .count();
+    let matched_prefix_internal_ne_profile_pk4_match_count = family_entries
+        .iter()
+        .filter(|family| {
+            family.has_matched_locomotive_pair
+                && family.internal_ne_profile_found_in_pk4 == Some(true)
+                && !UNMATCHED_LOCOMOTIVE_DISPLAY_NAMES
+                    .contains(&family.primary_display_name.as_deref().unwrap_or(""))
+        })
+        .count();
+    let matched_prefix_internal_ne_profile_pk4_missing_count = family_entries
+        .iter()
+        .filter(|family| {
+            family.has_matched_locomotive_pair
+                && family.internal_ne_profile_found_in_pk4 == Some(false)
+                && !UNMATCHED_LOCOMOTIVE_DISPLAY_NAMES
+                    .contains(&family.primary_display_name.as_deref().unwrap_or(""))
+        })
+        .count();
+    let unmatched_display_internal_ne_profile_pk4_match_count = family_entries
+        .iter()
+        .filter(|family| {
+            family.has_matched_locomotive_pair
+                && family.internal_ne_profile_found_in_pk4 == Some(true)
+                && UNMATCHED_LOCOMOTIVE_DISPLAY_NAMES
+                    .contains(&family.primary_display_name.as_deref().unwrap_or(""))
+        })
+        .count();
+    let unmatched_display_internal_ne_profile_pk4_missing_count = family_entries
+        .iter()
+        .filter(|family| {
+            family.has_matched_locomotive_pair
+                && family.internal_ne_profile_found_in_pk4 == Some(false)
+                && UNMATCHED_LOCOMOTIVE_DISPLAY_NAMES
+                    .contains(&family.primary_display_name.as_deref().unwrap_or(""))
+        })
+        .count();
     let internal_ne_profile_texture_size_counts = side_view_imb_pk4_lookup
         .as_ref()
         .map(|lookup| lookup.internal_ne_profile_texture_size_counts.clone())
@@ -549,10 +595,15 @@ pub fn inspect_engine_types_dir(
         car_side_view_resource_pk4_missing_counts,
         car_auxiliary_stem_counts,
         car_auxiliary_stem_relation_counts,
+        car_auxiliary_stem_distinct_pair_counts,
         internal_ne_profile_pk4_match_count,
         internal_ne_profile_pk4_missing_count,
         locomotive_pair_internal_ne_profile_pk4_match_count,
         locomotive_pair_internal_ne_profile_pk4_missing_count,
+        matched_prefix_internal_ne_profile_pk4_match_count,
+        matched_prefix_internal_ne_profile_pk4_missing_count,
+        unmatched_display_internal_ne_profile_pk4_match_count,
+        unmatched_display_internal_ne_profile_pk4_missing_count,
         internal_ne_profile_texture_size_counts,
         internal_ne_profile_horizontal_scale_modifier_counts,
         internal_ne_profile_max_percent_of_interface_vram_counts,
@@ -933,6 +984,16 @@ fn classify_car_auxiliary_stem_relation(family: &EngineTypeFamilyEntry) -> Optio
     Some("distinct_auxiliary_stem".to_string())
 }
 
+fn distinct_car_auxiliary_stem_pair_label(family: &EngineTypeFamilyEntry) -> Option<String> {
+    (classify_car_auxiliary_stem_relation(family)?.as_str() == "distinct_auxiliary_stem")
+        .then_some(())?;
+    Some(format!(
+        "{} -> {}",
+        family.internal_stem.as_deref()?,
+        family.auxiliary_stem.as_deref()?
+    ))
+}
+
 fn strip_terminal_role_letter(value: &str) -> Option<&str> {
     let last = value.chars().last()?;
     matches!(last, 'L' | 'T' | 'l' | 't').then(|| {

docs/rehost-queue.md

@@ -12,11 +12,12 @@ This file is the short active queue for the current runtime and reverse-engineer
 
 - 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 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, 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 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 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).

docs/rehost-queue/engine-types-parser-semantics-2026-04-21.md

@@ -71,6 +71,12 @@ first `.car` / `.lco` / `.cgo` / `.cct` inspector pass landed.
   - `CarSideView_2.imb`: `512x256`, `MaxPercentOfInterfaceVRAM = 0.02`
   - every packaged `_NE.imb` profile: `512x128`, `HorizontalScaleModifier = 0.75`,
     `MaxPercentOfInterfaceVRAM = 0.09`, and `ImageWHScaled` present
+- The `_NE` profile split is now tied back to the locomotive display census:
+  - `43` matched locomotive display-prefix families resolve `{internal_stem}_NE.imb`
+  - `18` matched display-prefix families still do not resolve `{internal_stem}_NE.imb`
+  - `0` unmatched display-tail families resolve `{internal_stem}_NE.imb`
+  - all `5` unmatched display-tail families (`242 A1`, `Class 460`, `Class A1`, `Class P8`,
+    `Class QJ`) are missing packaged `_NE` profiles
 
 ## What The Current Parser Now Owns
 
@@ -81,6 +87,7 @@ first `.car` / `.lco` / `.cgo` / `.cct` inspector pass landed.
   - auxiliary stem slot
   - side-view resource name
   - auxiliary-stem relation counts across the shipped corpus
+  - exact distinct auxiliary-stem pair counts
   - PK4-backed side-view resource resolution status
   - derived `{internal_stem}_NE.imb` resolution status
 - `.lco`
@@ -102,6 +109,7 @@ first `.car` / `.lco` / `.cgo` / `.cct` inspector pass landed.
 - `rt3_2IMB.PK4` link surface
   - packaged side-view profile summaries for `CarSideView_*`
   - packaged `_NE.imb` texture-size and scalar-family counts
+  - packaged `_NE.imb` match counts split by grounded display prefix vs unmatched display tail
 
 ## Remaining Static Questions