ci: replace broken default workflows with compile/unit/integration CI

The two scaffold workflows (Python application / Python package) failed on
every PR: they installed deps from a non-existent requirements.txt, ran
flake8/pytest over the vendored yt_dlp fork (new syntax under the 3.8/3.9
matrix), and collected ad-hoc root scripts — notably test_ai.py, which is
an invalid pasted object dump (not Python).

- Remove python-app.yml / python-package.yml and the junk root scripts
  (test.py, test_ai.py, test_time.py)
- Add .github/workflows/ci.yml with three PR-check jobs:
  * compile     — py_compile every first-party .py (no deps)
  * unit        — pytest on pure logic (conanjurer_functions, constants)
  * integration — boot the Flask services and assert the X-Conjurer-Api-Key
                  auth contract (communication_subroutine + conjurer_musician)
- Add tests/ suite, pytest.ini (testpaths=tests) and conftest.py (sys.path)

Fixes surfaced by the compile gate / needed for the integration job:
- conjurer_librarian/search_bot.py + search_bot2.py: f-string reused the
  same quote ({item["exists"]}) -> SyntaxError on Python < 3.12
- conjurer_musician/media_search_functions.py: made import-safe
  (env-overridable paths, lazy DB load / mkdir) so the service can be
  imported and tested off the Pi

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

.github/workflows/ci.yml

@@ -0,0 +1,64 @@
+name: CI
+
+on:
+  push:
+    branches: ["main"]
+  pull_request:
+    branches: ["main"]
+
+permissions:
+  contents: read
+
+jobs:
+  # ---------------------------------------------------------------- compile
+  # Byte-compiles every first-party Python file. Catches syntax errors (e.g.
+  # a misplaced `from __future__` import) without needing any dependencies.
+  compile:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.11"
+      - name: py_compile first-party sources
+        run: |
+          # Vendored forks (yt_dlp, spotify_dl) are excluded — they ship their
+          # own validity and use syntax not meant for this gate.
+          git ls-files '*.py' \
+            | grep -vE '^(yt_dlp|spotify_dl)/' \
+            | xargs python -m py_compile
+          echo "All first-party sources compile."
+
+  # ------------------------------------------------------------------- unit
+  # Pure-logic tests. The modules under test guard their optional/heavy
+  # dependencies, so only pytest is required.
+  unit:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.11"
+      - name: Install test deps
+        run: |
+          python -m pip install --upgrade pip
+          pip install pytest
+      - name: Run unit tests
+        run: pytest tests/unit -v
+
+  # ------------------------------------------------------------ integration
+  # Boots the Flask services (no Discord/network) and exercises their HTTP
+  # surface — primarily the X-Conjurer-Api-Key auth contract end to end.
+  integration:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.11"
+      - name: Install service deps
+        run: |
+          python -m pip install --upgrade pip
+          pip install pytest flask waitress requests
+      - name: Run integration tests
+        run: pytest tests/integration -v

.github/workflows/python-app.yml

@@ -1,39 +0,0 @@
-# This workflow will install Python dependencies, run tests and lint with a single version of Python
-# For more information see: https://docs.github.com/en/actions/automating-builds-and-tests/building-and-testing-python
-
-name: Python application
-
-on:
-  push:
-    branches: [ "main" ]
-  pull_request:
-    branches: [ "main" ]
-
-permissions:
-  contents: read
-
-jobs:
-  build:
-
-    runs-on: ubuntu-latest
-
-    steps:
-    - uses: actions/checkout@v3
-    - name: Set up Python 3.10
-      uses: actions/setup-python@v3
-      with:
-        python-version: "3.10"
-    - name: Install dependencies
-      run: |
-        python -m pip install --upgrade pip
-        pip install flake8 pytest
-        if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
-    - name: Lint with flake8
-      run: |
-        # stop the build if there are Python syntax errors or undefined names
-        flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
-        # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
-        flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
-    - name: Test with pytest
-      run: |
-        pytest

.github/workflows/python-package.yml

@@ -1,40 +0,0 @@
-# This workflow will install Python dependencies, run tests and lint with a variety of Python versions
-# For more information see: https://docs.github.com/en/actions/automating-builds-and-tests/building-and-testing-python
-
-name: Python package
-
-on:
-  push:
-    branches: [ "main" ]
-  pull_request:
-    branches: [ "main" ]
-
-jobs:
-  build:
-
-    runs-on: ubuntu-latest
-    strategy:
-      fail-fast: false
-      matrix:
-        python-version: ["3.8", "3.9", "3.10"]
-
-    steps:
-    - uses: actions/checkout@v3
-    - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v3
-      with:
-        python-version: ${{ matrix.python-version }}
-    - name: Install dependencies
-      run: |
-        python -m pip install --upgrade pip
-        python -m pip install flake8 pytest
-        if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
-    - name: Lint with flake8
-      run: |
-        # stop the build if there are Python syntax errors or undefined names
-        flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
-        # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
-        flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
-    - name: Test with pytest
-      run: |
-        pytest