ci(actions): add Gitea Actions ci+release workflows + fix ruff findings

- .gitea/workflows/ci.yml: ruff + matrix pytest on 3.10/3.11/3.12
  on push and PR to main; concurrency cancels superseded runs
- .gitea/workflows/release.yml: gate (ruff + pytest) + build sdist/wheel
  on tag 'v*', uploads via actions/upload-artifact@v4
- README.md: add ci and version badges right under H1
- src/viandante/cli.py: drop unused prompt_toolkit.patch_stdout import
- tests/test_deadsouls.py: add missing RoomBlock import (F821)
- tests/test_logger.py: drop unused local 'raw' in unicode test
- tests/test_mapper.py: rename unused locals to _a/_b/_c (F841) to
  preserve intent (B has 's' back-edge; C is orphan)

.gitea/workflows/ci.yml

@@ -0,0 +1,58 @@
+name: ci
+
+"on":
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+concurrency:
+  group: ci-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  ruff:
+    name: lint (ruff)
+    runs-on: ubuntu-22.04
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Python 3.12 (for ruff)
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.12"
+
+      - name: Install dev extras (pulls ruff from pyproject)
+        run: |
+          python -m pip install -U pip
+          python -m pip install -e ".[dev]"
+
+      - name: Run ruff
+        run: python -m ruff check src tests
+
+  pytest:
+    name: pytest (py${{ matrix.python-version }})
+    runs-on: ubuntu-22.04
+    strategy:
+      fail-fast: false
+      matrix:
+        python-version: ["3.10", "3.11", "3.12"]
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v5
+        with:
+          python-version: ${{ matrix.python-version }}
+          cache: pip
+          cache-dependency-path: pyproject.toml
+
+      - name: Install dev extras
+        run: |
+          python -m pip install -U pip
+          python -m pip install -e ".[dev]"
+
+      - name: Run pytest
+        run: python -m pytest -q

.gitea/workflows/release.yml

@@ -0,0 +1,71 @@
+name: release
+
+"on":
+  push:
+    tags:
+      - "v*"
+
+concurrency:
+  group: release-${{ github.ref }}
+  cancel-in-progress: false
+
+jobs:
+  gate:
+    name: gate (ruff + pytest)
+    runs-on: ubuntu-22.04
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Python 3.12
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.12"
+          cache: pip
+          cache-dependency-path: pyproject.toml
+
+      - name: Install dev extras
+        run: |
+          python -m pip install -U pip
+          python -m pip install -e ".[dev]"
+
+      - name: Ruff
+        run: python -m ruff check src tests
+
+      - name: Pytest
+        run: python -m pytest -q
+
+  build:
+    name: build (sdist + wheel)
+    needs: gate
+    runs-on: ubuntu-22.04
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Python 3.12
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.12"
+          cache: pip
+          cache-dependency-path: pyproject.toml
+
+      - name: Install build + dev extras
+        run: |
+          python -m pip install -U pip
+          python -m pip install build
+          python -m pip install -e ".[dev]"
+
+      - name: Build sdist and wheel
+        run: python -m build
+
+      - name: Inspect artifacts
+        run: ls -la dist/
+
+      - name: Upload distributions as artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: viandante-dist
+          path: dist/*
+          if-no-files-found: error
+          retention-days: 90