ci: make workflow ASCII-clean to fix startup_failure

The em-dash characters in the job comments tripped the workflow validator
(startup_failure, 0s). Rewrite ci.yml with plain ASCII and simpler comments.

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

.github/workflows/ci.yml

@@ -10,10 +10,8 @@ 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:
+    # Byte-compile every first-party .py to catch syntax errors. No deps.
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
@@ -22,17 +20,11 @@ jobs:
           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
+          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:
+    # Pure-logic tests; tested modules guard heavy deps, so only pytest needed.
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
@@ -46,10 +38,8 @@ jobs:
       - 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:
+    # Boot the Flask services and assert the X-Conjurer-Api-Key auth contract.
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4