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

.gitea/workflows/build.yml

@@ -0,0 +1,96 @@
+name: Full build
+
+on:
+  push:
+    branches: [main]
+    tags: ["v*"]
+  pull_request:
+  workflow_dispatch:
+
+jobs:
+  checks:
+    name: Import + headless tests
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install Godot 4.3
+        run: |
+          curl -sL -o /tmp/godot.zip \
+            https://github.com/godotengine/godot/releases/download/4.3-stable/Godot_v4.3-stable_linux.x86_64.zip
+          unzip -qo /tmp/godot.zip -d /tmp/godot-bin
+          sudo install /tmp/godot-bin/Godot_v4.3-stable_linux.x86_64 /usr/local/bin/godot
+
+      - name: Cache imported assets
+        uses: actions/cache@v4
+        with:
+          path: .godot
+          key: godot-import-${{ hashFiles('project.godot', 'src/**/*.gd', 'content/**/*.json') }}
+
+      - name: Import project (build class cache)
+        run: godot --headless --import
+
+      - name: Run headless test suite
+        shell: bash
+        run: |
+          set +e
+          output=$(godot --headless --path . --script res://src/test/test_runner.gd 2>&1)
+          status=$?
+          echo "$output"
+          echo "exit=$status"
+          if [ "$status" -ne 0 ]; then
+            echo "::error::Tests failed"
+            exit 1
+          fi
+          if echo "$output" | grep -q "SCRIPT ERROR"; then
+            echo "::error::Script errors detected"
+            exit 1
+          fi
+
+  build:
+    name: Full desktop build + optional release
+    # Tags and manual dispatches produce installable binaries. Branch pushes and
+    # pull requests only run the cheap checks job (export templates are ~1 GB).
+    if: startsWith(github.ref, 'refs/tags/') || github.event_name == 'workflow_dispatch'
+    runs-on: ubuntu-latest
+    needs: checks
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install Godot 4.3 and export templates
+        run: |
+          curl -sL -o /tmp/godot.zip \
+            https://github.com/godotengine/godot/releases/download/4.3-stable/Godot_v4.3-stable_linux.x86_64.zip
+          unzip -qo /tmp/godot.zip -d /tmp/godot-bin
+          sudo install /tmp/godot-bin/Godot_v4.3-stable_linux.x86_64 /usr/local/bin/godot
+          curl -sL -o /tmp/templates.tpz \
+            https://github.com/godotengine/godot/releases/download/4.3-stable/Godot_v4.3-stable_export_templates.tpz
+          mkdir -p ~/.local/share/godot/export_templates/4.3.stable
+          cd /tmp && rm -rf tpl && mkdir tpl && unzip -qo templates.tpz -d tpl
+          cp tpl/templates/* "$HOME/.local/share/godot/export_templates/4.3.stable/" 2>/dev/null || true
+          ls "$HOME/.local/share/godot/export_templates/4.3.stable" | head -5
+
+      - name: Import project
+        run: godot --headless --import
+
+      - name: Export Linux, Windows, macOS
+        run: |
+          chmod +x tools/*.sh
+          ./tools/build_releases.sh
+
+      - name: Upload installers (workflow_dispatch)
+        if: github.event_name == 'workflow_dispatch'
+        uses: actions/upload-artifact@v4
+        with:
+          name: step-line-build
+          path: build/*
+          if-no-files-found: error
+
+      - name: Publish Gitea release (tags only)
+        if: startsWith(github.ref, 'refs/tags/')
+        env:
+          GITEA_TOKEN: ${{ secrets.GITEA_TOKEN }}
+          VERSION: ${{ github.ref_name }}
+        run: |
+          chmod +x tools/publish_release.sh
+          ./tools/publish_release.sh "${VERSION#v}"