Preserve finer original sprite details in HD rendering

docs/hd-backlog.md

@@ -1,12 +1,12 @@
 # Original artwork HD backlog
 
-Current artwork/runtime checkpoint — 18 October 2026: the bundled pack contains **5,463 reviewed frames in 3,625 complete sequences**, including **4,338 Terrain pictures**. **290 original pictures still await approval**: 197 Terrain, 59 enemies and ground objects, 33 UI/other pictures and one boss. Remaining pictures include held drafts and actual provider refusals.
+Current runtime checkpoint — 18 October 2026: the included SourceF runtime supports up to **256 listed Original detail cells**. Lists of 65–256 cells must cover at most one quarter of the authentic Original picture's painted cells. Legacy lists of up to 64 cells retain their behavior, and all existing cache identities through 128 cells stay unchanged.
 
-This update adds 37 Terrain pictures in four reviewed groups: all 16 pictures from `40425–40434`; five selected pictures (`2038d`, `2038e`, `20396`, `20397`, `20398`); both `2058b–2058c`; and 14 static pictures from `40365–40374`, excluding `40372` and `40374`. They use untouched older PNGs rather than newly generated artwork. Eight installed pictures now use the optional palette constraint. The static selection does not split an animation; the earlier whole-group holds and the new `40374` provider refusal remain recorded.
+Artwork coverage is unchanged at **5,463 frames in 3,625 complete sequences**, including **4,338 Terrain pictures**. **290 originals await approval**: 197 Terrain, 59 enemies and ground objects, 33 UI/other pictures and one boss. The eight palette opt-ins and all current raw PNGs, native headers, defaults and review histories remain unchanged. This runtime activation adds no artwork approval; larger-detail and palette trials require their own reviews.
 
-Validation accepts all 5,463 frames with zero rejects, plus 45 mods with one override. Three 1920×1080 SDL controls completed successfully, and Root viewed each full image. Their PNG, RGB and alpha results matched the H5426 controls across 6,220,800 pixels, with zero measured changes. These controls do not establish visibility of all 37 additions or coverage of every optional policy. The SourceE runtime and current Iron Coast resources, including Mission 2 version 1.0.2, are unchanged. The latest closed native Windows check is for H5426 at `3f3107d6`: 394 tests passed, 26 were ignored and none failed. A native Windows result for this new artwork revision is not claimed.
+Focused production checks passed 113 Rust tests and 186 Python tests; 5 existing Rust tests were ignored. Full validation accepts all 5,463 frames with zero rejects, plus 45 mods with one override. Three 1920×1080 SDL controls completed successfully, and Root viewed all three full images. Their PNG, RGB and alpha results matched the SourceE H5463 controls across 6,220,800 pixels, with zero measured changes. These unchanged-art controls do not establish coverage or artwork approval for lists above 128 cells, every optional policy or all placements. The latest closed native Windows result is exact SourceE H5426 at 3f3107d6: 394 passed, 26 ignored and zero failed; no native Windows SourceF execution is claimed.
 
-The [completion ledger](hd-completion.json) records the exact asset lists, review authorities and remaining material or placement limits. Existing historical records remain unchanged; these finite reviews do not establish seamless terrain, every placement or complete HD coverage. Validated package checkpoint; Git history records publication.
+Original details remain Original rather than generated HD. The longer-list allowance does not repair geometry or material faults, reverse held artwork or establish every placement. Iron Coast's current 45-package resources and Mission 2 version 1.0.2 are unchanged. Exact production and historical authorities are in [runtime release evidence](hd-runtime-release.json). Validated package checkpoint; Git history records publication.
 
 Preserved 17 October 2026 Source-update checkpoint at 5,384 (historical coverage): Current Source C+D runtime — 17 October 2026, published `a073f73f`: HD coverage remains **5,384 frames / 3,551 sequences**, with **369 originals remaining** (260 Terrain, 75 enemies/ground objects, 33 UI/other, one boss). Both executables are rebuilt; 90 Rust / 78 Python tests, HD validation and three exact 1080p regression controls pass. Five old Rust checks remain ignored. Source C+D native Windows CI is pending; the prior `58723547` result (361 passed / 26 ignored / zero failed) is a different epoch. Earlier material, context and QA records below remain historical; this source update adds no art approval.