Complete PRIORITY: release v0.2.0 published by CI; document download sign-in caveat

- Tag v0.2.0 pushed; Gitea Actions build job exported Linux/Windows/macOS
  and published the release via the host's GITEA_TOKEN secret (CI run 1095:
  'Release live: .../releases/tag/v0.2.0', Job succeeded)
- Verified tag page + /releases are public (HTTP 200); anonymous asset
  downloads require sign-in on the host (tracked as host-config follow-up)
- TODO cleaned per AGENTS.md; PRIORITY section moved to DONE.md
- README Downloads notes v0.2.0 live + sign-in caveat; MEMORY updated

DONE.md

@@ -173,6 +173,18 @@ Completed task sections moved from `TODO.md`. Sections are moved only when every
 - [x] `config/version` → `0.2.0`; `build/` artifacts rebuilt and Linux binary smoke-tested.
 - [x] New world/lighting headless tests (56 total).
 
+## 🔴 PRIORITY — Ship downloadable builds (complete 2026-10-31)
+
+- [x] Install Godot 4.3 export templates locally.
+- [x] `./tools/build_releases.sh` produces Linux/Windows/macOS artifacts (0.2.0).
+- [x] Linux binary smoke-tested (headless, 0 script errors).
+- [x] Publish the release: no local token needed — the host has the `GITEA_TOKEN` secret, so
+      pushing the `v0.2.0` tag made CI export all three platforms and publish automatically
+      (CI log run 1095: `Release live: …/releases/tag/v0.2.0`, Job succeeded).
+- [x] Confirm links resolve: tag page and `/releases` return HTTP 200 publicly.
+      Follow-up: anonymous **asset downloads** require sign-in on this host (host setting).
+- [x] CI packaging follow-up was already live (`.gitea/workflows/build.yml` on tags).
+
 ## 🎮 Assets & detailed graphics pass (textures, rigs, UI feedback)
 
 - [x] Authored texture set via `tools/generate_textures.py` (deterministic PIL): brick facade,