publish: drop diff detection, always run --all

Git diff is unreliable as a publish gate — failed runs silently drop
files. Wiki idempotency (commit SHA in banner) is now the sole
gating mechanism: unchanged pages are skipped, changed pages update.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.gitea/workflows/publish.yml

@@ -34,22 +34,6 @@ jobs:
       - name: Install Python deps
         run: pip install --no-cache-dir -r auto-wiki/pipelines/songs/requirements.txt
 
-      - name: Detect changed files
-        id: diff
-        run: |
-          BASE="${{ github.event.before }}"
-          HEAD="${{ github.sha }}"
-          if [ -z "$BASE" ] || echo "$BASE" | grep -qE '^0+$'; then
-            echo "mode=all" >> "$GITHUB_OUTPUT"
-          else
-            git -C ncmr-songs diff --name-only "$BASE" "$HEAD" -- '*.md' \
-              | grep -v '^wip/' | grep -v '^README\.md' \
-              > /tmp/changed.txt 2>/dev/null || true
-            cat /tmp/changed.txt
-            echo "mode=incremental" >> "$GITHUB_OUTPUT"
-            echo "files=$(tr '\n' ' ' < /tmp/changed.txt)" >> "$GITHUB_OUTPUT"
-          fi
-
       - name: Publish
         env:
           WIKI_API_URL: ${{ vars.WIKI_API_URL }}
@@ -58,15 +42,4 @@ jobs:
           WIKI_BOT_PASSWORD: ${{ secrets.WIKI_BOT_PASSWORD }}
           SOURCE_REF: ${{ github.sha }}
           GITEA_REPO_URL: ${{ vars.URL_TO_GITEA }}/mikkeli/ncmr-songs
-        run: |
-          if [ "${{ steps.diff.outputs.mode }}" = "all" ]; then
-            python auto-wiki/pipelines/songs/render.py --source-dir ncmr-songs --all
-          else
-            FILES="${{ steps.diff.outputs.files }}"
-            if [ -z "$FILES" ]; then
-              echo "No changed .md files. Nothing to publish."
-              exit 0
-            fi
-            # shellcheck disable=SC2086
-            python auto-wiki/pipelines/songs/render.py --source-dir ncmr-songs --files $FILES
-          fi
+        run: python auto-wiki/pipelines/songs/render.py --source-dir ncmr-songs --all