rework domain field

packages/shared/filename-tool/src/lib/config/DomainMapping.ts

@@ -1,26 +1,37 @@
 /**
- * `contentKind` → `domain` — the routing table from METADATA_KEYS.md §1.
+ * `contentKind` → `domain` / `workForm` — the routing tables from
+ * METADATA_KEYS.md §1.
  *
  * `domain` answers "which application is this record destined for?" and is the
- * key every client filters its catalogue on. It is **stored, not derived on
- * read**: that is what lets the `contentKind` vocabulary stay open, because a
- * peer that has never heard of a kind still routes the record correctly
- * without having to interpret the token.
+ * key every client filters its catalogue on — **one value per app**, no
+ * alternation. `workForm` answers the other question the old `film`/`tv` split
+ * was secretly encoding: is this work complete in itself, or one instalment of
+ * a run? It is cross-domain, so a comic issue is `serial` in `literature`
+ * exactly as an episode is `serial` in `screen`.
+ *
+ * Both are **stored, not derived on read**: that is what lets the `contentKind`
+ * vocabulary stay open, because a peer that has never heard of a kind still
+ * routes the record correctly without having to interpret the token.
  *
  * ⚠ This binding is **permanent and one-way**. Add kinds freely; never re-map
  * an existing kind to a different domain. Because the value is stored, two
  * peers on different versions that disagree about where a kind belongs produce
  * a split-brain that redeploying cannot heal — the wrong domain is already
  * written into records across the mesh. If a kind has to move, mint a new kind.
+ * The `film`+`tv` → `screen` merge (METADATA_KEYS.md §14.17) is the one
+ * deliberate exception, taken once and paid for with a corpus sweep.
+ *
+ * ⚠ Mirror of the Rust table in `meta-feeder-sdk::domain`. Edit both together.
  */
 export type Domain =
-    'film'
-    | 'tv'
+    'screen'
     | 'music'
-    | 'spoken'
     | 'literature'
     | 'science';
 
+/** Is the work complete in itself, or one instalment of a run? */
+export type WorkForm = 'standalone' | 'serial';
+
 /**
  * The one-way binding. A kind that is absent here has no domain, which means
  * the record is **not independently routable** — correct for sidecars
@@ -28,15 +39,19 @@ export type Domain =
  * else.
  *
  * ⚠ `pack` is deliberately absent: a season pack and an album release are the
- * same structural thing, so the kind alone cannot tell `tv` from `music`. The
- * writer stamps `pack`'s domain from its own context — see
+ * same structural thing, so the kind alone cannot tell `screen` from `music`.
+ * The writer stamps `pack`'s domain from its own context — see
  * {@link domainForContentKind}'s contract.
+ *
+ * ⚠ `podcast` / `podcastEpisode` are absent too: the `spoken` domain was
+ * retired unused, and the change that first *writes* those kinds picks their
+ * domain.
  */
 export const domainByContentKind: { [contentKind: string]: Domain } = {
-    // film / tv
-    movie: 'film',
-    series: 'tv',
-    episode: 'tv',
+    // screen — films and serials alike; the split lives in workFormByContentKind
+    movie: 'screen',
+    series: 'screen',
+    episode: 'screen',
     // music
     track: 'music',
     album: 'music',
@@ -44,9 +59,6 @@ export const domainByContentKind: { [contentKind: string]: Domain } = {
     musicVideo: 'music',
     djMix: 'music',
     liveSet: 'music',
-    // spoken
-    podcast: 'spoken',
-    podcastEpisode: 'spoken',
     // literature
     book: 'literature',
     // An audiobook's identity is the book — same author, same ISBN family,
@@ -60,6 +72,35 @@ export const domainByContentKind: { [contentKind: string]: Domain } = {
     paper: 'science',
 };
 
+/**
+ * The `workForm` twin of {@link domainByContentKind}.
+ *
+ * ⚠ `pack` is absent for the same reason: a season pack is `serial`, an album
+ * release is `standalone`, and only the writer knows which.
+ */
+export const workFormByContentKind: { [contentKind: string]: WorkForm } = {
+    // screen
+    movie: 'standalone',
+    series: 'serial',
+    episode: 'serial',
+    // music — an album is a closed work, not an ongoing run, so every rung of
+    // the music ladder is standalone.
+    track: 'standalone',
+    album: 'standalone',
+    artist: 'standalone',
+    musicVideo: 'standalone',
+    djMix: 'standalone',
+    liveSet: 'standalone',
+    // literature — the split that proves workForm is not a screen-only axis.
+    book: 'standalone',
+    audiobook: 'standalone',
+    comic: 'serial',
+    manga: 'serial',
+    magazine: 'serial',
+    // science
+    paper: 'standalone',
+};
+
 /**
  * Resolve the domain a `contentKind` belongs to.
  *
@@ -72,3 +113,13 @@ export function domainForContentKind(contentKind: string | undefined | null): Do
     if (!contentKind) return undefined;
     return domainByContentKind[contentKind.trim()];
 }
+
+/**
+ * Resolve the work form a `contentKind` sits on. Same contract as
+ * {@link domainForContentKind}: `undefined` means "not derivable", never a
+ * guess. Whoever writes `contentKind` writes both of these in the same breath.
+ */
+export function workFormForContentKind(contentKind: string | undefined | null): WorkForm | undefined {
+    if (!contentKind) return undefined;
+    return workFormByContentKind[contentKind.trim()];
+}