v0.3.0: display abstraction, map-browser menu, SAGE terrain tiling/blends

- ra3.client::display: shared interactive loops; SDL and Vulkan backends
  implement only the primitives (init/present/poll_event/window_size/
  key_down/present_terrain). ra3.display picks the backend.
- Menu: maps by localized name (gamestrings.csf), red/gold theme, hover
  highlight, mouse + keyboard, wheel scroll, fullscreen and FPS/vsync
  options, loading progress bar.
- Terrain: continuous tile sampling via a texture array (REPEAT, uv =
  cell/(2*cellSize)) removes per-cell grid seams; SAGE blend ramp for
  material transitions; FPS label + top-right minimap overlays.
- Skip the skirmish sim for map views; reuse the Vulkan texture; no idle
  terrain redraw.

docs/ROADMAP.md

@@ -18,25 +18,36 @@ that each one produces something that builds and runs.
       `import std;` in every module; added an isolated Windows cross-build
       (llvm-mingw + SDL3 MinGW) producing `openra3.exe` + `SDL3.dll`, alongside
       the Linux build. Both images are separate to keep the toolchains apart.
+- [x] **v0.3.2 — real terrain.** `ra3.terrain` parses the map's `HeightMapData`
+      and `BlendTileData` and rasterises the actual terrain from the install's
+      `Terrain.big` tile textures (top-down, elevation-shaded), replacing the
+      `<map>_art.tga` overview as what `render` draws.
+- [x] **v0.3.0 — real balance + skirmish + Vulkan.** `ra3.data` pins the retail
+      numbers (damage types, `ArmorTemplate` percentages, weapons, units,
+      structures, ore economy) audited from EA's open RA3 XML; `ra3.skirmish` is
+      rebuilt on them (armour resolution, weapon target masks, pay-as-you-go
+      build queue, power, tech prerequisites, refinery ore cycle, team-wipe
+      victory); and `ra3.vulkan` replaces the presentation stack with Vulkan
+      (SDL3 surface, embedded SPIR-V), with a null fallback where no loader
+      exists.
 
 ## Next
 
-- [ ] **v0.1.1 — correct world calibration.** Parse the map heightmap
-      dimensions (and `MPPositionList` starts) so the unit overlay lines up with
-      the map art instead of using an assumed world size.
-- [ ] **v0.2.0 — data & file formats.** Parse compiled gameplay assets
-      (`GameObject`, `WeaponTemplate`, `ArmorTemplate`, `LocomotorTemplate`) so
-      units use the real balance numbers instead of OpenRA3's stand-ins.
-- [ ] **v0.3.0 — deterministic simulation.** Real update modules, locomotor
-      movement, weapons/damage/armour resolution, build queues and the tech
-      tree, pathfinding and shroud.
-- [ ] **v0.4.0 — AI.** Skirmish AI: build states, team composition, attack
-      waves (the reference tree's `AI*` modules).
-- [ ] **v0.5.0 — full renderer.** Terrain heightmap rendering, W3D models and a
-      D3D9/Vulkan/OpenGL client backend implementing `ra3::client::display`,
-      plus full input.
-- [ ] **v0.6.0 — content.** Load real maps, units, powers and strings; play a
-      skirmish end-to-end with a UI.
+- [ ] **v0.3.1 — tactical map view.** The Vulkan/SDL viewer reproduces the
+      retail tactical view (`TheTacticalView`, `ra3_1.12.game` `0x00cdb7b4`):
+      opens centred on the player's start, wheel zoom, edge scroll and clamped
+      pan. A hand-rolled HUD was tried and removed — the real in-game interface
+      is `.apt` art that must be recovered first, so it is not on the near
+      roadmap.
+- [ ] **v0.4.0 — real update modules.** Locomotor movement, projectiles and
+      warheads, build placement, shroud, and pathfinding, driven by the
+      `GameObject` module set recovered from the binary.
+- [ ] **v0.5.0 — data-driven content.** Deserialise the compiled assets
+      (`global.bin`/`static.*.bin` + `.manifest`) so `ra3.data` reads the
+      install instead of pinned constants; real maps, models and strings.
+- [ ] **v0.6.0 — full renderer.** Perspective terrain (the heightmap is decoded
+      but drawn top-down today), W3D models and the full in-game client on
+      Vulkan, plus input.
 
 ## Cross-cutting tracks