feat(hero): stepped medallion relief, seated on the parapet face

The medallions were not just flat - they were buried. seat_on_front put
Hero_Medallion at offset 0.08 (front Y -0.42) while the 1.2 m-deep parapet stands
at Y -0.15, so both discs sat inside the parapet and never rendered. The motto
band and surround have the same burial (offset 0.06) and are a separate follow-up.

- Three stepped layers per medallion with per-layer prefixes so seat_on_front gives
  each its own stand-off: Rim (0.55 m, dark, offset 0.36 -> Y -0.14), Field
  (0.38 m, light, offset 0.43 -> Y -0.07), Boss (0.15 m, dark, offset 0.50 -> Y 0.00).
  A single Hero_Medallion prefix would both flatten the relief and (via startswith)
  swallow the specific prefixes, so it is removed.
- Moved from +/-6.2 (inside the inscription text, which spans +/-6.87) to +/-9.8.
- Fixed Tools/review/hero_iterate.sh, which still had the pre-tools-move
  'cd dirname/..' and landed in Tools/ instead of the repo root.

Rendered and judged; the advisory two-model judge (no, 0.93) no longer flags the
medallions. Owner review pending.

MEMORY.md

@@ -661,3 +661,10 @@ The related lesson: a prefix-based clear (`clear(("Demo_", "PlayerStart", ...))`
 ## 2026-11-10 — Render-to-import chain, in one order
 
 A visual change needs **build → import → render**, never just a render: `render_screenshots.sh` renders the imported Unreal assets. `Tools/review/e2e_asset_check.py` runs the whole thing (Blender renders → empty maps → both builds → captures → two-model judge → README) and is the command to use instead of remembering four.
+
+## 2026-11-10 — Hero attic: the medallions were buried, not just flat
+
+- **`seat_on_front` offsets are relative to `FRONT_Y` (the wall plane, Y −0.5), not to the parapet face.** The parapet is 1.2 m deep with its front at Y −0.15, so any applied detail with offset < 0.35 sits *inside* the parapet and never renders. The medallions (offset 0.08 → front −0.42) and the motto band + surround (offset 0.06 → front −0.44) were all buried; only the inscription (moved to 0.40 → front −0.10 in the previous commit) read.
+- **Medallion fix:** stepped relief with per-layer prefixes so `seat_on_front` gives each its own stand-off — `MedallionRim` 0.36, `MedallionField` 0.43, `MedallionBoss` 0.50. One shared prefix (`Hero_Medallion`) would seat every disc at the same offset and flatten the relief, and it also matched the more specific prefixes via `startswith`, so it had to be removed entirely.
+- **Medallions were also at ±6.2, inside the inscription text (spans ±6.87).** Moved to ±9.8.
+- **`Tools/review/hero_iterate.sh` still had the pre-move `cd "$(dirname "$0")/.."`** from the tools restructure — it landed in `Tools/` and failed `find Art` with "no such file". Fixed to `../..`, matching `render_screenshots.sh`.