Remove dialogue tone-of-voice system, add Gitea Actions full build, add venue cycling

- Delete Rules.Tone/TONE_NAMES, NpcProfile.tone_modifiers, tone params on
  NPCController.roll_reaction/apply_player_action; dialogue_lines flattened
  to Array[String]; HUD tone label, T binding, and hud.tone_prefix removed
- Docs updated everywhere (PLAN, README, DONE, MEMORY); PLAN section heading
  'Tone and Design Direction' -> 'Design Direction'
- Add .gitea/workflows/build.yml: checks job (import+tests) on push/PR; full
  build job (export templates, Linux/Windows/macOS exports, artifact upload,
  and tag-based Gitea release publish via GITEA_TOKEN) on tags/dispatch
- Remove old .github/workflows/ci.yml to avoid double runs
- Add venue cycling (V) across all three scenarios with hud.venue_switched
- Refresh README screenshots to match the new HUD
- 53/53 tests pass, boot smoke clean

docs/RELEASING.md

@@ -26,18 +26,29 @@ godot --headless --export-release "Linux" build/step-line-smoke.x86_64
 `project.godot` sets `config/version`. Keep it in sync with the release tag
 (e.g. `v0.3.0` → `config/version="0.3.0"`, plus a git tag `v0.3.0`).
 
-## 3. Run the checks first
+## 3. CI (Gitea Actions)
 
-A release candidate must pass:
+The repository ships a Gitea Actions workflow (`.gitea/workflows/build.yml`):
+
+- Every push/PR runs the **checks** job: Godot 4.3 install, project import, and the
+  full headless test suite. This is the fast safety net.
+- **Tags (`v*`)** and **manual `workflow_dispatch`** runs additionally execute the
+  **build** job: export templates install, import, `tools/build_releases.sh` for
+  Linux/Windows/macOS, artifact upload, and — on tags — release publication via
+  `tools/publish_release.sh`.
+
+For tag builds, set a repo secret named **`GITEA_TOKEN`** (write:repository scope).
+Without it the workflow still builds and tests, but the release publish step fails.
+
+> The workflow lives in `.gitea/workflows/` (Gitea's canonical path). The old
+> `.github/workflows/ci.yml` was removed to avoid double runs on hosts that scan
+> both directories.
+
+## 4. Local build (alternative to CI)
 
 ```bash
 godot --headless --path . --script res://src/test/test_runner.gd   # all tests
 godot --headless --path . --quit-after 120                        # boot smoke test
-```
-
-## 4. Build
-
-```bash
 ./tools/build_releases.sh
 ```