fix(ci): repair corrupted YAML in workflow files

Python replacement introduced control char (0x01) instead of
backreference (\1) in sed commands. Fixed both workflows.

Authored-by: Moko Consulting

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.mokogitea/workflows/auto-release.yml

@@ -80,7 +80,7 @@ jobs:
         id: platform
         run: |
           # Read platform from manifest.xml <platform> element; fallback to generic
-          PLATFORM=$(sed -n 's/.*<platform>\([^<]*\)<\/platform>.*/
/p' .mokogitea/manifest.xml 2>/dev/null | head -1 | tr -d '[:space:]')
+          PLATFORM=$(sed -n 's/.*<platform>\([^<]*\)<\/platform>.*//p' .mokogitea/manifest.xml 2>/dev/null | head -1 | tr -d '[:space:]')
           [ -z "$PLATFORM" ] && PLATFORM="generic"
           echo "platform=$PLATFORM" >> "$GITHUB_OUTPUT"
           echo "Platform detected: ${PLATFORM}"

.mokogitea/workflows/pre-release.yml

@@ -55,7 +55,7 @@ jobs:
       - name: Detect platform
         id: platform
         run: |
-           tr -d '[:space:]')| tr -d '[:space:]')
+          PLATFORM=$(sed -n 's/.*<platform>\([^<]*\)<\/platform>.*/\1/p' .mokogitea/manifest.xml 2>/dev/null | head -1 | tr -d '[:space:]')
           [ -z "$PLATFORM" ] && PLATFORM="generic"
           echo "platform=$PLATFORM" >> "$GITHUB_OUTPUT"
           # For packages: prefer pkg_*.xml in src/; fallback to any manifest