feat(songs): inject Category:Songs for pages with an album

Pages with a valid `album` field now get [[Category:Songs]] prepended
before [[Category:Album:<name>]]. Companion/sibling pages without an
album are unaffected. Updated SCHEMA.md and pipeline README accordingly.

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

pipelines/songs/README.md

@@ -13,7 +13,7 @@ Implemented:
 - Pandoc-based markdown → wikitext body rendering
 - First-line h1 stripping
 - Auto-generated banner (`{{Auto-generated|source=...|commit=<sha>}}`)
-- Album category injection (`[[Category:Album:<name>]]`); additional categories via `categories` list
+- Album category injection (`[[Category:Songs]]` + `[[Category:Album:<name>]]` when `album` is set); additional categories via `categories` list
 - LRC file upload (idempotent SHA1 check) + footer link
 - Inter-page sibling placeholder resolution (`[[TAG]]` → `[[wiki page title|label]]`)
 - MediaWiki bot API write with idempotency — no-op if wiki content matches generated output
@@ -80,7 +80,7 @@ The pipeline always runs `--all`: every file with `wiki.publish: true` (not unde
 | Body rendering | Pandoc-based, with a thin Python pre/post-processor | 2026-06-09 |
 | Excluded paths | `wip/**`, plus repo-meta files | 2026-06-09 |
 | Page template | Designed from scratch (no existing wiki pages to mirror) | 2026-06-09 |
-| Album categories | Auto-injected `[[Category:Album:<name>]]`; category page is user-written and not overwritten | 2026-06-09 |
+| Album categories | Auto-injected `[[Category:Songs]]` + `[[Category:Album:<name>]]` when `album` is set; category pages are user-written and not overwritten | 2026-06-09 |
 | Additional categories | Optional `categories` list in frontmatter; each entry → `[[Category:<value>]]` | 2026-06-10 |
 | `album` optional | Companion/sibling pages don't need an album; omitting the field emits no album category | 2026-06-10 |
 | Sibling resolution | Parent declares siblings as a bill of materials (`path` + `tag` + optional `label`); `[[TAG]]` substituted post-Pandoc | 2026-06-10 |

pipelines/songs/SCHEMA.md

@@ -51,11 +51,11 @@ Files under `wip/` are also skipped, regardless of `wiki.publish`.
 
 #### `album` (string)
 
-The full album name. Drives `[[Category:Album:<album name>]]` injection at the bottom of the rendered wiki page.
+The full album name. Drives `[[Category:Songs]]` and `[[Category:Album:<album name>]]` injection at the bottom of the rendered wiki page.
 
-Example: `album: Shirakaba Express Service` → category tag `[[Category:Album:Shirakaba Express Service]]`.
+Example: `album: Shirakaba Express Service` → category tags `[[Category:Songs]]` and `[[Category:Album:Shirakaba Express Service]]`.
 
-Pages without an album (companion documents, placeholders, songs without an assigned album) simply omit this field — no category is injected unless `categories` provides one.
+Pages without an album (companion documents, placeholders, songs without an assigned album) simply omit this field — neither category is injected unless `categories` provides one.
 
 #### `categories` (list of strings)
 
@@ -139,7 +139,7 @@ For each `.md` with `wiki.publish: true` and not under `wip/`:
 4. Substitute `TAG` placeholders with resolved `[[Page|Display]]` wikilinks (or fallback text).
 5. Prepend the auto-generated banner: `{{Auto-generated|source=<source URL>|commit=<sha>}}`.
 6. If `lrc` is declared: upload the LRC file if its SHA1 has changed; append a `[[Media:…]]` link.
-7. Append category tags: `[[Category:Album:<album>]]` if `album` is set; `[[Category:<cat>]]` for each entry in `categories`.
+7. Append category tags: `[[Category:Songs]]` and `[[Category:Album:<album>]]` if `album` is set; `[[Category:<cat>]]` for each entry in `categories`.
 8. Read the current wiki page content via the MediaWiki API; if identical to the generated output, skip the write (idempotency — keeps the wiki history clean).
 9. If the page exists and does not start with `{{Auto-generated`, skip with a warning (manual page protection).
 10. Otherwise, write the page with an edit summary referencing the source commit.
@@ -152,7 +152,7 @@ For each `.md` with `wiki.publish: true` and not under `wip/`:
 - Banner template injection
 - LRC file upload and footer link
 - Sibling placeholder resolution (`[[TAG]]` → `[[wiki page title|label]]`)
-- Album category injection (`[[Category:Album:<name>]]`)
+- Album category injection (`[[Category:Songs]]` + `[[Category:Album:<name>]]`) when `album` is set
 - Additional categories via `categories` list
 - Idempotent writes (no-op skip when content matches)
 - Manual-page protection (skip pages without auto-gen banner)

pipelines/songs/publish.py

@@ -106,6 +106,7 @@ def build_wikitext(fm: dict, body_wikitext: str, source_url: str, source_ref: st
 
     cat_parts = []
     if fm.get("album"):
+        cat_parts.append(f"[[Category:Songs]]")
         cat_parts.append(f"[[Category:Album:{fm['album']}]]")
     for cat in (fm.get("categories") or []):
         cat_parts.append(f"[[Category:{cat}]]")