feat(ses): add SES light novel pipeline; extract shared lib/wiki.py

New pipeline at pipelines/ses/ publishes mikkeli/ses-light-novel to
the SES: MediaWiki namespace. All pages get Category:SES and
Category:SES:<type> (type from frontmatter, fallback to parent dir name).

Shared functions (connect_wiki, markdown_to_wikitext, strip_first_h1,
AUTO_BANNER_PREFIX) extracted from songs/publish.py into lib/wiki.py;
songs refactored to import from there.

Also adds publish-ses.yml workflow stub and updates Dockerfile and
root README.

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

.gitea/workflows/publish-ses.yml

@@ -0,0 +1,41 @@
+on:
+  workflow_call:
+    inputs:
+      SOURCE_REF:
+        description: "Commit SHA that was pushed to ses-light-novel"
+        required: true
+        type: string
+
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+    container:
+      image: novoyuuparosk-wiki-runner:latest
+
+    steps:
+      - name: Checkout ses-light-novel
+        env:
+          FAPAT: ${{ secrets.FAPAT }}
+          URL_TO_GITEA: ${{ vars.URL_TO_GITEA }}
+        run: |
+          git clone "http://mikkeli:${FAPAT}@${URL_TO_GITEA#http://}/mikkeli/ses-light-novel" ses-light-novel
+          git -C ses-light-novel checkout ${{ inputs.SOURCE_REF }}
+
+      - name: Checkout auto-wiki
+        env:
+          FAPAT: ${{ secrets.FAPAT }}
+          URL_TO_GITEA: ${{ vars.URL_TO_GITEA }}
+        run: git clone "http://mikkeli:${FAPAT}@${URL_TO_GITEA#http://}/mikkeli/novoyuuparosk-auto-wiki" auto-wiki
+
+      - name: Publish
+        env:
+          WIKI_API_URL: ${{ vars.WIKI_API_URL }}
+          WIKI_BASE_URL: ${{ vars.WIKI_BASE_URL }}
+          WIKI_BOT_USER: ${{ secrets.WIKI_BOT_USER }}
+          WIKI_BOT_PASSWORD: ${{ secrets.WIKI_BOT_PASSWORD }}
+          SOURCE_REF: ${{ inputs.SOURCE_REF }}
+          GITEA_REPO_URL: ${{ vars.URL_TO_GITEA }}/mikkeli/ses-light-novel
+        run: |
+          python auto-wiki/pipelines/ses/publish.py \
+            --source-dir ses-light-novel \
+            --all