Rename Step Line to Gig Line

Update the game name in project.godot, export presets, UI/marquee/title strings, packaging (AppImage/NSIS/desktop/appdata), tools, docs, and the generated prop GLBs. Packaging assets and README screenshots are regenerated. Headless suite 209/209 and Python tooling tests pass.

MEMORY.md

@@ -28,6 +28,14 @@ Session memory for durable decisions, state, and gotchas. Keep concise, remove o
 
 ## Handoff (read this first)
 
+- **Visual-alignment pass planned (2026-11-01):** `TODO.md` gains a "Visual
+  alignment with rendered mockups" section. Goal: restructure generated-image
+  storage, move the reference mockups out of `docs/screens/designs/` into a
+  runtime-accessible root (e.g. `assets/images/`), load the proposed UI/scene
+  art at runtime (start menu, selection screens, HUD, panels), and make the game
+  match the mockups — verified by `screen_designs.py compare` + `judge`. Not
+  started; no code moved yet.
+
 - **Phase 2 — AI texturing (this agent, DONE 2026-11-01).** Phase 1 assets were
   already in the tree (untracked) and are preserved. Generated six seamless AI
   clothing albedos into `assets/textures/npc/ai/{shirt,trousers,jacket,vest,
@@ -86,7 +94,7 @@ Session memory for durable decisions, state, and gotchas. Keep concise, remove o
   aim-free selection with wheel cycling and Shift precision walk (ADR-0011/0012), and a **Web**
   export target. `export_presets.cfg` gains a `Web` preset with `variant/thread_support=false`
   (static hosting, no COOP/COEP); `tools/build_releases.sh` exports `build/web/` and zips it to
-  `build/step-line-web-<ver>.zip`, and `publish_release.sh` uploads it. Covered by
+  `build/gig-line-web-<ver>.zip`, and `publish_release.sh` uploads it. Covered by
   `src/test/tests/test_web_export.gd`.
 - **Prop atlas (v0.3.1):** `model_pipeline.atlas_for()` builds a per-prop power-of-two PNG with
   one 8×8 cell per palette role, plus a metallic/roughness atlas (G=roughness, B=metallic). The
@@ -352,7 +360,7 @@ Session memory for durable decisions, state, and gotchas. Keep concise, remove o
   and published — installers/AppImage are on the releases page. Releasing = bump version → tag → push.
 - NSIS gotchas (validated in a local ubuntu:24.04 docker repro): makensis uses `-D` defines
   (never `/D`), resolves relative `-DICON`/`-DARTIFACT` against the **script directory** so CI
-  passes `$PWD`-absolute paths; installed exe must be space-free (`step-line.exe`); ICO must be
+  passes `$PWD`-absolute paths; installed exe must be space-free (`gig-line.exe`); ICO must be
   classic BMP entries (ImageMagick `icon:auto-resize=48,32,16`; PIL emits PNG-compressed ICOs NSIS
   cannot load).
 - appimagetool runs system `appstreamcli` if present (strict, exit 3 on warnings) — project