Oblivion Compatibility Audit

Oblivion is the oldest title and exercises code no other game reaches. This audit owns Oblivion's data through the shared mechanisms (routing: .claude/commands/_audit-owners.md): only dimensions whose Paths are Oblivion-specific stay here; a defect in the shared mechanism goes to its owner audit.

Architecture: Orchestrator. Each dimension runs as a Task agent (max 3 concurrent).

Read .claude/commands/_audit-common.md (layout, methodology, dedup, finding format) and .claude/commands/_audit-severity.md for shared protocol.

What Makes Oblivion Different

Two NIF eras share Oblivion - Meshes.bsa: the retail body (v20.0.0.4, bsver 11, plus a v20.0.0.5 minority; inline strings, u16 flags) and a v10.x NetImmerse tail (down to pre-Gamebryo v3.3.0.13) with tight nif.xml version bands. Neither has a per-block size table: one N-byte under-read discards the rest of the file (no block_size recovery as on 20.2.0.7+), so drift is silent and Oblivion-only. The v10.x stride-drift family (#1506-#1509) is resolved — a regression-guard set. The 2026-09-05 CRITICAL (a NiSkinPartition reservation: clean rate 100% -> 92.41%, 730 of 9 612 meshes lost) is what a skipped corpus run looks like.

Aspect	State (verify; pull live figures)
NIF	Baselines: crates/nif/tests/data/per_block_baselines/oblivion.tsv, crates/nif/tests/data/block_coverage_baselines/oblivion_truncations.tsv (truncating=0; 9 612 NIFs = base + 8 DLC archives)
BSA	v103; 17 archives / 147 629 files extract with 0 errors. Folder record is 16 B for v103 and v104 (24 B only for v105, open.rs)
Exterior	Tamriel (0,0) radius 1 renders on-device; live figure in docs/engine/exterior-readiness-plan.md (#2377 / #2368 closed); ROADMAP.md Oblivion row
Runtime baseline	.claude/audit-baselines/runtime/oblivion-ICMarketDistrictTheGildedCarafe.tsv
Reference data	/mnt/data/SteamLibrary/steamapps/common/Oblivion/Data/

Authoring census (byte-scan of Oblivion.esm, 2026-09-19): 2 393 SCPT, 390 QUST, 604 CLOT, 8 228 PGRD, 0 NAVI / NAVM, 19 278 INFO with 0 PNAM / 0 ANAM, 306 LVSP, 229 LTEX, 37 WTHR (all with HNAM). No locomotion\ directory (the walk clip is handtohandforward.kf); 9 889 .lod names in Oblivion - Meshes.bsa.

Known-open, do not re-file (gh issue view first): #5505 (child worldspaces draw no parent LAND / terrain LOD, Dim 4), #5351 (HNAM doc rot), #5526 (Phase V voice never resolves — no VTCK/VTYP, voices ship as race\sex .mp3, Dim 5), #5439 (the drift corpus treats an unopenable archive as absent, Dim 1), #5011 (the EGM sweep pins nothing). Latent, closed as a doc fix (#5350, 9a95a50fe, Dim 2): Oblivion's opening dialogue menu is the player's known-topics list (an INFO NAME "Add Topics" or a script AddTopic; 1 761 of 3 184 Topic DIALs are TCLT targets and never NAME targets), but topic_entry (byroredux/src/systems/npc_dialogue.rs) still has no Oblivion arm — every branch-less Oblivion topic classifies TopLevel. Nothing observes it today (Oblivion has no quest aliases, so no NPC owns a topic); wiring Oblivion ownership needs an arm returning LinkOnly for the TCLT-only set. Fixed since 2026-10-08 — verify, don't re-file: #5504 (legacy 4-byte PKDT / 12-byte PTDT, dae08000d, Dim 2), #5073 (empty-payload compressed BSA entry, fa2af0e89, Dim 2), #5335 (Oblivion distant water, e38ff49d2, Dim 4), #5516 + #5519 (one inherit-all boundary, REGN-CNAM claim retired, 65cadde2f, Dim 4), #5487 (body table + race body skins, 1b45763fa, Dim 3), #5397 (Random stack, 0436bea5c, Dim 2), #5374 + #5388 (child water + climate, 67afa4b95 / 217bcbc9f, Dim 4), #5400 + #5377 (menuxml 16-bpp / narrow-mask DDS, 5c53ad9c7 / 015e10549, Dim 5), #5402 (parse_dds decodes DDPF_LUMINANCE L8 / L8A8 — all 470 luminance *_g.dds glow maps in the base + Shivering Isles texture archives parse and expand; guards parse_and_expand_l8_luminance, parse_and_expand_l8a8_luminance_with_alpha, Dim 3).

Parameters (from $ARGUMENTS)

--focus <dimensions>: comma-separated numbers (e.g. 1,3). Default: all 5.

Phase 1: Setup

1. Parse $ARGUMENTS; mkdir -p /tmp/audit/oblivion.
2. Dedup baseline: gh issue list --repo matiaszanolli/ByroRedux --limit 200 --json number,title,state,labels > /tmp/audit/issues.json.
3. Confirm Oblivion/Data/ exists; if not, name the dimensions that lose real-data validation.
4. Run the corpus lane first (release build; the plain cargo test lane never runs it): cargo test -p byroredux-nif --release --test parse_real_nifs --test per_block_baselines --test block_coverage_baselines --test oblivion_stream_drift_corpus -- --ignored oblivion no_block_sizes. Any red gate is the headline finding.
5. Scope by delta: git log --since=<last AUDIT_OBLIVION date> --format='%h %cs %s' -- <dimension Paths>.
6. Toolchain: the byroredux bin crate needs rustc >= 1.96 (wasmtime 49, 15a6b1d2d) — rustup cargo per docs/contributing.md § Toolchain note (#4466).
7. Always name Oblivion.esm real-data tests (cheap: ~3 s): a whole-crate cargo test -p byroredux-plugin -- --ignored spikes >20 GB and can kill the session.

Phase 2: Launch Dimension Agents (parallel)

Dimension 1: NIF Version Handling & Corpus Integrity (v20.0.0.4 + the v10.x tail)

Subagent: legacy-specialist
Routing: generic stream position / dispatch / version gating -> /audit-nif; collision translation -> /audit-nifal, /audit-physics. This dimension owns the Oblivion-only bands and the corpus.
Paths: crates/nif/src/header.rs, crates/nif/src/version.rs, crates/nif/src/stream.rs, crates/nif/src/lib.rs, crates/nif/src/blocks/ (controller/, properties.rs, legacy blocks), crates/nif/tests/
First step: the Phase 1 corpus lane; git log --since=<date> --format='%h %cs %s' -- crates/nif/src/header.rs crates/nif/src/blocks crates/nif/src/lib.rs

• Corpus gates are the guard: 0 truncating, 0 unknown, per-block histogram equal to oblivion.tsv (per_block_baseline_oblivion, oblivion_block_count_parity, no_block_sizes_drift_detector_has_zero_false_positives_on_real_corpus). Coverage differs: the histogram gate walks only Oblivion - Meshes.bsa (8 032 NIFs — Game::mesh_archives keeps DLC optional), while oblivion_block_count_parity adds the 8 DLC archives (9 612) — a DLC-only histogram shift is invisible to the former. unknown growth or parsed shrinkage is a stride-drift regression — escalate, do not re-derive; diff the histogram for new block types.
• Header quirks (each pinned; aim at what the pin cannot see — a new off-band version): user_version exists only for >= v10.0.1.8; BSStreamHeader is the nif.xml dual band V10_0_1_2 || (user_version >= 3 && (V20_2_0_7 || V20_0_0_5 || (V10_1_0_0..=V20_0_0_4 && user_version <= 11))) (bs_stream_header_not_read_for_off_spec_version, #170); v10.0.0.0..10.1.0.114 blocks carry a leading 4-byte group_id (mixing stream-relative and file offsets is the classic false trail); pre-5.0.0.1 files inline block-type names, decided by version, not by an empty type table (uses_inline_block_type_names, #4257).
• NiTexturingProperty reads a u32 shader-map count directly — no leading Has Shader Textures bool (nif.xml is wrong; Gamebryo 2.3 is authoritative). Pin: parse_ni_texturing_property_with_zero_shader_maps (crates/nif/src/blocks/properties_tests.rs, #149).
• NiGeomMorpherController trailing field gates on bsver >= bsver::MORPH_LEGACY_CUTOFF (10; blocks/controller/morph.rs): doghead.nif (v10.2.0.0 bsver 9) must skip it, bsver-11 rigs (obgatemini01.nif) keep it (path_lookat_tests.rs, #1509).
• The sizeless runtime-size-cache recovery must refuse a skip that contradicts the failed block (#3926, crates/nif/src/lib.rs) — a plausible-looking recovery is silent mis-alignment.
• Scene walk: as_ni_node (crates/nif/src/import/walk/mod.rs) unwraps every NiNode-wrapper subclass (BSOrderedNode, NiBillboardNode, BsFaceGenNiNode, …); a missed subclass drops the whole subtree. NiSwitchNode / NiLODNode deliberately take switch_active_children instead (active index / LOD 0 only). All five walkers share a per-walk visited bitset + MAX_NIF_NODE_DEPTH (revisit_guard, #5485, cf8730adc; hostile-input defense owned by /audit-nif — vanilla trees visit each block once either way).
• Deep-trace 3 meshes (Heinrich Oaken Halls chandelier, a book, a creature head) through import_nif_scene: mesh count + material chain. Tools: nif_stats, recovery_trace (crates/nif/examples/).
  Output: /tmp/audit/oblivion/dim_1.md

Dimension 2: BSA v103 & ESM Data Slice (Oblivion.esm)

Subagent: general-purpose
Routing: reader discipline /audit-parsers; GRUP walk / SubReader / remap / dispatch /audit-esm. This dimension owns TES4-only decode branches and their real-data pins.
Paths: crates/bsa/src/archive/, crates/plugin/src/esm/records/ (actor/, items.rs, climate.rs, pathgrid.rs, misc/dialogue.rs, misc/pack.rs), crates/plugin/src/esm/cell/walkers.rs
First step: cargo test -p byroredux-bsa --release --test bsa_real -- --ignored oblivion, then cargo test -p byroredux-plugin --release --test parse_real_esm -- --ignored clas_oblivion_knight race_oblivion (single named tests).

• BSA v103 is a regression guard (#699): oblivion_all_bsas_v103_brute_force_extract_zero_errors sweeps all 17 archives; the 35 zero-byte .txt placeholders Oblivion stores compressed extract as empty files — BsaArchive::extract decides the empty-stream edge itself before any decoder, because flate2 1.1.10 reports an empty zlib stream as UnexpectedEof (#5073 / #5660, fa2af0e89; extract_returns_empty_for_a_zero_size_compressed_placeholder, extract_rejects_a_nonzero_size_with_no_compressed_stream in crates/bsa/src/archive/tests.rs); embed_file_names gates on >= BSA_V_FO3_SKYRIM, and the "Xbox archive" flag several v103 archives set must not change name handling.
• 16-byte ACBS (#1650): Oblivion NPC_/CREA ACBS is 16 B (flags u32 @0, level i16 @10), distinct from the >=24 B FNV/FO3/Skyrim layout, so parse_npc needs the GameKind::Oblivion arm gated on len >= 16 before the FNV arm (else level defaults to 1 and every actor reads Male). Pins: oblivion_16byte_acbs_parses_level_and_gender, fnv_ignores_16byte_acbs.
• DIAL/INFO selection: every INFO authors QSTI (its own quest), decoded into InfoRecord.quest and applied at selection by the FO3/FNV dialogue path (#5271, dbc07e8f0; consumer byroredux/src/systems/npc_dialogue.rs). Every Oblivion activation opens through the generic GREETING topic (#5367 Phase G), so the positional Random stack is live here: the first passing INFO wins, and a Random one rolls with the immediately following passing Random INFOs up to a plain line or a Random End (Flags1 bit 5; GREETING carries 461 Random INFOs in 102 runs, 57 Random End) (#5397, 0436bea5c; earlier_random_set_wins_over_a_later_plain_line, random_end_and_plain_lines_bound_the_random_stack in crates/scripting/src/dialogue.rs). No dialogue live gate runs Oblivion (docs/smoke-tests/dt1-dialogue-layers.sh is FNV) — the rule is unit-pinned, not verified in a conversation. Topic reachability is a separate, latent gap (#5350, above): the P4 classifier treats every branch-less Oblivion topic as a list entry, not the known-topics set.
• Legacy leveled lists (#4638): TES4 LVLO rows may be 8 bytes with no count (default 1; 94 rows / 14 lists) and LVLD bit 0x80 is the all-levels flag, not chance-none. Pins: oblivion_8byte_lvlo_rows_decode_with_default_count, lvld_high_bit_is_flag_not_chance_none (crates/plugin/src/esm/records/container.rs).
• EFID is a 4-char effect code, not a FormID: SPEL/ENCH/ALCH/INGR effect ids resolve through EsmIndex::resolve_magic_effect -> magic_effects_by_code on Oblivion (#5084, ce73f658b; 142 of 149 distinct SPEL codes resolve, resolve_magic_effect_routes_oblivion_efid_codes) and are kept out of the load-order FormID remap (#5076, 9b099b31f). A new effect consumer that indexes magic_effects directly silently no-ops on Oblivion.
• Corpses are marked on the base actor: NPC_/CREA record-header bit 0x80000 Starts Dead, decoded only under GameKind::Oblivion and ORed onto placements (#5013, dca2bb401). Pins: oblivion_only_base_starts_dead_bit (crates/plugin/src/esm/records/dispatch_actor.rs), oblivion_starts_dead_bases_and_their_placements_match_the_audit_census (87 NPC_ + 48 CREA bases, 787 placements).
• Legacy PACK shapes (#5504, dae08000d): parse_pack accepts Oblivion's 4-byte PKDT (u16 flags, u8 procedure, junk byte) beside the 8-byte FO3/FNV form, and the 12-byte PTDT (type, target, count — no trailing f32). Before this 479 packages read as Find (650 placements) and no package carried a target, so all 208 Follow packages idled. Pins: oblivion_legacy_pkdt_and_twelve_byte_ptdt_decode (misc/pack.rs), parse_rate_oblivion_pack_legacy_pkdt_and_ptdt (crates/plugin/tests/parse_real_esm.rs, --ignored).
• Other TES4 branches: MGEF-by-code map (oblivion_mgef_populates_magic_effects_by_code), CONT 4-byte payload guard, CLMT three-entry WLST keyed on GameKind, RACE/CLAS is_oblivion / flags_oblivion arms (real-data pins above), XCLL sizes [28, 32, 36] with the >= 92 ambient-cube arm game-validated to Skyrim/FO4/FO76 (crates/plugin/src/esm/cell/tests/cell.rs).
• CLOT enters inventory as a wearable ItemKind::Armor (parse_clot: BMDT slots, MODL/MOD3 male/female meshes; SLGM likewise). Pin: oblivion_clothing_enters_inventory_and_gender_aware_equipment (records/tests.rs). The EsmIndex.clothing doc now carries the measured 604 (#5086, e7e8829b9).
• Navigation is PGRD-only (pathgrid.rs, 8 228 grids; layout census in its header). As of 2026-09-29 CellData.pathgrids has no consumer beyond the walker: docs/engine/navmesh-pathfinding.md covers NAVM only, so Oblivion packages have no path graph.
• DIAL/INFO: with zero PNAM / ANAM, speakers resolve through the GetIsID condition fallback and build_conversation_tree must order without PNAM chains (#3600); TCLF / NAME / CTDT and multi-segment responses are kept (#3614, #3616); LVSP (306) dispatches (#3617); SBSP (33) / ROAD (2) are recorded in RecordType as deliberate non-goals (#3619).
  Output: /tmp/audit/oblivion/dim_2.md

Dimension 3: Legacy-Property Rendering Path (highest historical yield)

Subagent: renderer-specialist
Routing: the single material boundary / no render-time fallback / emitter translation /audit-nifal; Disney-BSDF gate (MAT_FLAG_PBR_BSDF must be 0, no BGSM/.mat) /audit-renderer.
Paths: crates/nif/src/import/material/ (legacy_properties.rs, walker.rs), byroredux/src/npc_spawn.rs, byroredux/src/npc_spawn/seam_blend.rs, byroredux/src/cell_loader/spawn/mesh_instance.rs, byroredux/src/scene/nif_loader.rs, byroredux/src/render/static_meshes.rs, byroredux/src/asset_provider/texture.rs, crates/renderer/shaders/include/material_sampling.glsl
First step: cargo test -p byroredux --bin byroredux parallax_alpha_gate (rustup toolchain, see Phase 1) and git log --since=<date> --format='%h %cs %s' -- crates/nif/src/import/material byroredux/src/render byroredux/src/cell_loader/spawn

• APPLY_HILIGHT2 is Oblivion's parallax flag. The importer records parallax_height_in_alpha on the intent alone (parallax_map.is_none()) because Oblivion authors no normal slot (14 bump_texture uses in the whole mesh archive pair); normals resolve by filename (derive_normal_map_path, #1303) downstream of MaterialInfo, and the asset provider binds that _n.dds into the height slot (mesh_instance.rs, nif_loader.rs, #3596). Height is the normal's alpha: when the bound normal has none (BC1/BC4/BC5 return A = 1.0, sliding the whole surface) the render site must withhold PARALLAX_ALPHA_HEIGHT_BIT and zero the height slot (#3562, #4260). Guard: byroredux/src/render/parallax_alpha_gate_tests.rs; it cannot see the real alpha-format split — 2026-09-11 census: 1 274 APPLY_HILIGHT2 properties, 100 with a BC1 _n.dds; re-measure.
• The bit is bit 31 of parallaxMapIndex: every shader reader must mask it (textures[0x8000000N] is out of bounds) and both POM marchers (material_sampling.glsl, secondary-ray ray_hit.glsl) must honor the channel. Scale defaults are the named DEFAULT_PARALLAX_* constants, never literals (#4263).
• Apply modes 1 (APPLY_DECAL) and 3 (APPLY_HILIGHT) are decoded and unconsumed: 681 of 30 121 instances are non-default and their PC semantics are unsourced (#3625, 2026-09-11) — no value is guessed for them.
• Legacy properties (pins in crates/nif/src/import/material/: emissive_source_tests.rs, alpha_flag_tests.rs, double_sided_tests.rs, stencil_state_capture_tests.rs): raw monitor-space NiMaterialProperty colors; all 11 AlphaFunction values routed, per-slot blend fallback (#4262); NiWireframeProperty -> LINE pipeline and NiShadeProperty.flat_shading -> fragment shader (#869); NiStencilProperty dormant except the two-sided promotion (#930). The dark-map role is live only on Oblivion (8 meshes / 6 files, #4523): dark_texture_role_population_matches_the_documented_census (crates/nif/tests/translation_completeness.rs, --ignored) and dark_combine_is_the_pinned_bare_multiply_in_both_paths (crates/renderer/src/vulkan/scene_buffer/shader_contract_tests.rs).
• NPC body assembly (humanoid_body_paths, byroredux/src/npc_spawn.rs): Oblivion has its own kf-era table — upperbody / lowerbody / hand / foot plus female* twins, biped bits 0x04 / 0x08 / 0x10 / 0x20 — never FO3/FNV's lefthand / righthand, which its archive does not ship. Each part skins from the RACE body-section ICON run (INDX 0 UpperBody .. 4 Tail, RaceRecord::body_part_textures; 15 / 15 races author 8), swapped in at import so the shared NIF cache keeps the Imperial skin every body NIF authors (#5487, 1b45763fa; body_paths_kf_era_match_each_games_archive, installed_oblivion_body_paths_exist_in_the_meshes_archive (--ignored) in byroredux/src/npc_spawn/tests.rs). Pre-fix most humanoids spawned handless, partly dressed ones legless, and beast/mer torsos human.
• Spawn-time NPC skin seam blend (seam_blend.rs; checklist in /audit-fnv Dim 4) bakes a tone ratio into head/hand vertex colours and now reads the race-overridden body skins — verify on Oblivion's own textures\characters\ skins that necks tone against the race's torso, and no armour/clothing mesh is blended into.
• Emitters: 140 of 208 emitter-bearing Oblivion NIFs carry several NiPSysEmitters (obgatemini01.nif 11, transformation.nif 13); each ImportedParticleEmitter needs its own kinematics / curve / rate, not the first match (#4261, then #4467 when that fix lost rates behind opaque sibling controllers, and #4560 for the legacy NiPSysEmitterCtlrData tier); APP_CULLED / editor-marker particle leaves are skipped in both walkers (#4561). Oblivion's leg of real_archive_torch_meshes_surface_particle_emitters (--ignored) is the guard; the pre-Skyrim emitter layout is version-gated (#1239).
  Output: /tmp/audit/oblivion/dim_3.md

Dimension 4: Exterior & Lighting Data (Tamriel)

Subagent: general-purpose
Routing: WTHR / sun / terrain / LOD / water translation mechanism -> /audit-exterior. This dimension checks the Oblivion-only inputs.
Paths: byroredux/src/cell_loader/ (placement_lod.rs, terrain.rs), byroredux/src/env_translate/, byroredux/src/systems/light_anim.rs, crates/plugin/src/esm/cell/, docs/engine/exterior-readiness-plan.md
First step: docs/smoke-tests/m-exteriors.sh oblivion static (needs a Vulkan device), and git log --since=<date> --format='%h %cs %s' -- byroredux/src/cell_loader byroredux/src/env_translate

• _far.nif placement LOD is real only here (placement_lod_supported_is_oblivion_only; FO3/FNV ship none and use ObjectLodScheme::FalloutLegacyBlocks): confirm placements and LOD textures still resolve on a Tamriel exterior.
• WTHR.HNAM (Oblivion-only HDR block, 37 / 37 weathers): the sunlight dimmer rides the EXAL boundary onto WeatherDataRes and multiplies the sampled sun colour; absence is a neutral 1.0 and a short/degenerate block must clamp, not go negative (sunlight_dimmer_translates_from_the_hnam_block, env_translate/sky_weather.rs).
• LTEX / default land textures: Oblivion LTEX.ICON is relative to landscape\ and rooted there at the parse boundary (226 of 229 resolve; three ship nowhere), default land texture is Default.DDS (DefaultLandTexture::for_game), and layers without TX01 take the diffuse's _n sibling. Pins (--ignored, byroredux/src/cell_loader/terrain.rs): oblivion_ltex_paths_exist_in_vanilla_archives, default_land_textures_exist_in_vanilla_archives. A checkerboard on lake/sea beds means a missing key.
• __MAX_Default_Light (the 3ds Max key/fill NiDirectionalLight pair on 48 Oblivion meshes, 0 on FO3/FNV) never spawns as a scene light (#5189, e44152d45; byroredux/src/cell_loader/nif_light_spawn_gate_tests.rs); the Gilded Carafe runtime baseline's light_count_directional is 0 — a 1 there is this artifact back.
• Child-worldspace inheritance: Oblivion authors no PNAM, so crates/plugin/src/esm/cell/wrld.rs stamps the land / LOD / water / climate inherit bits on every child (WNAM set) at parse — pre-FO3 "child inherits everything"; 54 / 54 roots author NAM2, 0 / 30 children do (#5374, 67afa4b95). Bravil's canals, Leyawiin's river, the Imperial City districts and New Sheoth resolve the parent's water (default_water_for_worldspace, pin oblivion_child_inherits_parents_water_through_the_parse_stamp); nothing consumes the land / LOD bits yet (#5505). This parse-time stamp is the only inherit-all implementation (#5516, 65cadde2f, deleted the dead flag-less inherit_all_up_chain copy and oblivion_climate_rungs' unconditional first chain step); a fixture with zero flags no longer exercises Oblivion inheritance. Pin: oblivion_child_gets_the_inherit_all_stamp_and_eras_stay_real (crates/plugin/src/esm/cell/tests/wrld.rs: child 0x1B, root 0, an authored FO3+ zero stays zero).
• Distant water is live (#5335, e38ff49d2): Oblivion authors NAM2 but no NAM3 / NAM4 / DNAM, so the old NAM4 gate suppressed all of it. resolve_distant_water (env_translate/lod.rs) takes the full-detail resolver's height / form (default_water_for_worldspace) and prefers the authored LOD form only where NAM3 exists; the mesh is holed by the resident cell set (is_resident), not a radius. A flat sea missing past the loaded ring on a Tamriel exterior is this regressing.
• Climate — one boundary, resolve_exterior_climate (byroredux/src/env_translate/climate.rs; #5423, b3e679dba, moved the rungs out of the cell loader; #5584, c140cb48e, split env_translate.rs into lod / climate / water / sky_weather / fallback): the WRLD CNAM up the WNAM chain (SEWorld children -> SEWorldClimate), then the centre cell's XCLR -> REGN CNAM (region_climate_for_center, pin region_climate_follows_xclr_order_and_neighbour_probes in exterior.rs) — inert on vanilla, which authors 0 REGN CNAM on 211 regions (#5421) — then the Oblivion-only oblivion_climate_rungs (#5388, 217bcbc9f; inherit-all is already resolved by the stamp-gated resolve_worldspace_climate that runs first, #5516): the CS naming convention <worldspace>Climate along the whole chain root included (vanilla authors no Tamriel WRLD CNAM, so Tamriel and its city/district children resolve TamrielClimate, WLST Clear 100), and the richest-weather climate as a warn-logged last resort (pre-fix all 30 children fell to AllWeather). Pins: oblivion_child_inherits_the_parent_authored_climate, oblivion_child_finds_the_named_climate_through_the_chain_root, richest_climate_is_the_logged_last_resort. A generic warm-band palette + fallback clock, or that warn, on a Tamriel exterior means the chain fell through; cell_climate_probe (crates/plugin/examples/) prints it per grid.
• LIGH falloff: an authored 0.0 means "default", which is the quadratic 2.0 pre-Skyrim (falloff_exponent_sentinel_resolves_per_layout_generation, light_anim.rs) — not the Skyrim 1.0.
• Embedded NiControllerSequence animation (423 files / 792 sequences: gates, banners) must reach the ECS on cell load (#3602); frozen animated statics are the symptom. Repeatable gate: m-exteriors.sh oblivion static|boundary|soak|cycle|water and /audit-runtime --game oblivion.
  Output: /tmp/audit/oblivion/dim_4.md

Dimension 5: Gameplay & UI Data Slice (M47.3 ObScript quests, MenuXml HUD)

Subagent: general-purpose
Routing: quest-script runtime /audit-scripting; HUD drivers / MenuXml eval-layout-raster /audit-ui, parse side /audit-parsers; gameplay mechanism /audit-gameplay.
Paths: crates/scripting/src/obscript_vm.rs, crates/scripting/src/obscript_quests.rs, byroredux/src/hud.rs, crates/menuxml/, byroredux/src/cell_loader/references/attach.rs
First step: cargo test -p byroredux-scripting --release -- --ignored vanilla_oblivion_quest_scripts_execute_and_setstage (BYROREDUX_OBLIVION_DATA, ~160 MB resident; it fails rather than passes without data under BYROREDUX_REQUIRE_GAME_DATA=1 and runs as a named step in .github/workflows/real-data-gates.yml — #5088, 1377d3463) and git log --since=<date> --format='%h %cs %s' -- crates/scripting crates/menuxml byroredux/src/hud.rs

• M47.3 (mechanism /audit-scripting): 255 vanilla QUST scripts install once per load order and tick every 5 s (fQuestProcessInterval); command ids were derived empirically from Oblivion.esm and 2 349 of 2 393 SCPT decode clean (residue: per-command string-argument signatures); unknown commands are counted, never faked. Reference operands index the SCRO and SCRV subrecords interleaved in record order (ScriptRef; SCHR.num_refs counts both, 2 393 / 2 393), a reference-variable slot resolves to nothing and an unresolved explicit caller is declined (#5629, aac6b25b3 — before it 39 of 511 quest-stage calls named the wrong quest); a tag-r Set is set <ref>.<remote var> and is declined and counted, not stored as a ref assignment (#5630); argument payloads are bounds-checked against the statement's argument region (#5655, 291af4528). Oblivion's dialect is Obse (obscript_dialect_follows_the_profile_not_the_game_kind). Object-script blocks, Message UI and actor-state functions are phase 2 (ROADMAP M47.3).
• MenuXml HUD (--hud, HudGameProfile::oblivion): the XML authors the art, so the driver pushes only trait overrides (hudmain_health_full / hudmain_magic_full / hudmain_fatigue_full, hudmain_compass_window user0, HUDMainMenu user3); XML + 5 font slots come from Oblivion - Misc.bsa, art from Oblivion - Textures - Compressed.bsa (three Menus / Menus80 / Menus50 sets). The MenuXml DDS decoder (crates/menuxml/src/tex.rs) takes 16-bpp A4R4G4B4 / R5G6B5 and zero/narrow-mask L8 / A8 headers (#5400, 5c53ad9c7; #5377, 015e10549) — 49 vanilla textures\menus\ files that warned "not found" now decode, and an undecodable candidate warns as such; pin menu_texture_header_census_decodes (crates/menuxml/tests/vanilla_corpus.rs, zero undecodable headers). Bars key on AVIF editor ids Health / Magicka / Fatigue resolved per load through PlayerVitals (#4675); Oblivion.esm authors no AVIF records and the legacy actor-value resolver is unbuilt (ROADMAP Status), so none resolve and the bars draw full unless hud.values pins them. (The comment above HudBar in hud.rs still describes the old Skyrim-keyed 0x3E8 read — doc rot, not behaviour.) Guards: crates/menuxml/tests/vanilla_corpus.rs (BYROREDUX_OBLIVION_DATA), docs/smoke-tests/m48-4-oblivion-hud.sh. The driver, throttle, overlay and eval/layout/raster are shared -> /audit-ui.
• Playable gate: docs/smoke-tests/p0-door-interaction.sh oblivion is the only gate oblivion.env declares; an undeclared gate exits 2 (unmeasured, not covered).
  Output: /tmp/audit/oblivion/dim_5.md

Phase 3: Merge

1. Read all /tmp/audit/oblivion/dim_*.md; combine into docs/audits/AUDIT_OBLIVION_<TODAY>.md:
   • Executive Summary — compatibility level (NIF parse incl. v10.x tail, archive extract, ESM parse, render); state the corpus-lane result first; cite ROADMAP / feature-matrix numbers.
   • Dimension Findings — grouped by severity per dimension.
   • Regression Guard List — stride-drift family (#1506-#1509), #170 dual band, NiTexturingProperty u32 count, BSA v103 sweep, parallax_alpha_gate_tests, Disney gate stays 0.
   • Open Work — from ROADMAP.md Known Issues; interiors and the Tamriel exterior already render, so neither is a blocker.
2. Remove cross-dimension duplicates.

Suggest: /audit-publish docs/audits/AUDIT_OBLIVION_<TODAY>.md
(label every finding game:oblivion + legacy-compat, plus its own domain label.)