refactor: fold machine-remote-data into remote-data.ts, PascalCase load lifecycle (RD-11)

`machine-remote-data.ts` defined a third encoding of an in-flight fetch:
`LoadLifecycle`. It had three call sites, all one identical line, and the type
was never imported by name. Move the mapping into `remote-data.ts` as
`fromLoadLifecycle`, beside its neighbour `fromResource` — a `RemoteData`
constructor, not a sixth encoding.

The lowercase `loading`/`failed`/`loaded` tags on `BriefState`,
`OrgTemplateState` and `StamdataEditorState` existed only because
`LoadLifecycle` required them. Now that the constraint is inline and
PascalCase, the three machines' load-lifecycle tags become `Loading`,
`Failed` and `Loaded` — matching their own PascalCase message tags in the
same file. `stamdata-editor.machine.spec.ts` no longer asserts a PascalCase
message producing a lowercase state.

`BriefStatus` (the letter's draft/submitted/approved/rejected/sent status,
parsed off the wire from `BriefViewDto`) is a separate tag family and is
untouched — its tag count stays 54 before and after this change.

Delete `machine-remote-data.ts` and merge its spec into `remote-data.spec.ts`.
Regenerate `behaviour-spec.mdx` (the `machineRemoteData` section heading
becomes `fromLoadLifecycle`) and confirm `gen:snippets` reports no drift, since
`remote-data.ts` carries a showcase region.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

libs/beheer/src/domain/stamdata-editor.machine.spec.ts

@@ -24,40 +24,40 @@ const seedLoaded = (): StamdataEditorState =>
 describe('stamdata-editor reduce', () => {
   it('Loaded snapshots original independently of rows', () => {
     const s = seedLoaded();
-    expect(s.tag).toBe('loaded');
-    if (s.tag !== 'loaded') return;
+    expect(s.tag).toBe('Loaded');
+    if (s.tag !== 'Loaded') return;
     const edited = reduce(s, { tag: 'CellEdited', row: 0, column: 'beroep', value: 'Chirurg' });
-    if (edited.tag !== 'loaded') return;
+    if (edited.tag !== 'Loaded') return;
     expect(edited.rows[0]['beroep']).toBe('Chirurg');
     expect(edited.original[0]['beroep']).toBe('Arts'); // snapshot untouched → diff works
   });
 
   it('RowAdded appends an empty row shaped by the schema', () => {
     const s = reduce(seedLoaded(), { tag: 'RowAdded' });
-    if (s.tag !== 'loaded') return;
+    if (s.tag !== 'Loaded') return;
     expect(s.rows).toHaveLength(2);
     expect(s.rows[1]).toEqual({ program: '', beroep: '', geldigVan: '', geldigTot: '' });
   });
 
   it('RowRemoved drops the row at the index', () => {
     const s = reduce(reduce(seedLoaded(), { tag: 'RowAdded' }), { tag: 'RowRemoved', row: 0 });
-    if (s.tag !== 'loaded') return;
+    if (s.tag !== 'Loaded') return;
     expect(s.rows).toHaveLength(1);
   });
 
   it('edit messages are ignored unless loaded', () => {
     expect(reduce(initial, { tag: 'RowAdded' })).toBe(initial);
     expect(
-      reduce({ tag: 'failed', reason: 'x' }, { tag: 'CellEdited', row: 0, column: 'a', value: 'b' })
+      reduce({ tag: 'Failed', reason: 'x' }, { tag: 'CellEdited', row: 0, column: 'a', value: 'b' })
         .tag,
-    ).toBe('failed');
+    ).toBe('Failed');
   });
 
   it('LoadFailed and Loading transition regardless of prior state', () => {
     expect(reduce(seedLoaded(), { tag: 'LoadFailed', reason: 'boom' })).toEqual({
-      tag: 'failed',
+      tag: 'Failed',
       reason: 'boom',
     });
-    expect(reduce(seedLoaded(), { tag: 'Loading' })).toEqual({ tag: 'loading' });
+    expect(reduce(seedLoaded(), { tag: 'Loading' })).toEqual({ tag: 'Loading' });
   });
 });

libs/beheer/src/domain/stamdata-editor.machine.ts

@@ -11,9 +11,9 @@ import { StamRow, StamTable, emptyRow } from '@beheer/domain/stamdata';
  * apply path is a reviewed PR, not a runtime write — ADR-0004).
  */
 export type StamdataEditorState =
-  | { tag: 'loading' }
-  | { tag: 'failed'; reason: string }
-  | { tag: 'loaded'; table: StamTable; rows: StamRow[]; original: readonly StamRow[] };
+  | { tag: 'Loading' }
+  | { tag: 'Failed'; reason: string }
+  | { tag: 'Loaded'; table: StamTable; rows: StamRow[]; original: readonly StamRow[] };
 
 export type StamdataEditorMsg =
   | { tag: 'Loading' }
@@ -24,29 +24,29 @@ export type StamdataEditorMsg =
   | { tag: 'RowRemoved'; row: number }
   | { tag: 'Seed'; state: StamdataEditorState }; // mount a specific state (stories/tests)
 
-export const initial: StamdataEditorState = { tag: 'loading' };
+export const initial: StamdataEditorState = { tag: 'Loading' };
 
 const copy = (rows: readonly StamRow[]): StamRow[] => rows.map((r) => ({ ...r }));
 
 export function reduce(s: StamdataEditorState, m: StamdataEditorMsg): StamdataEditorState {
   switch (m.tag) {
     case 'Loading':
-      return { tag: 'loading' };
+      return { tag: 'Loading' };
     case 'Loaded':
       // original is an independent snapshot so later edits never mutate it (drives the diff).
-      return { tag: 'loaded', table: m.table, rows: copy(m.rows), original: copy(m.rows) };
+      return { tag: 'Loaded', table: m.table, rows: copy(m.rows), original: copy(m.rows) };
     case 'LoadFailed':
-      return { tag: 'failed', reason: m.reason };
+      return { tag: 'Failed', reason: m.reason };
     case 'CellEdited':
-      if (s.tag !== 'loaded') return s;
+      if (s.tag !== 'Loaded') return s;
       return {
         ...s,
         rows: s.rows.map((r, i) => (i === m.row ? { ...r, [m.column]: m.value } : r)),
       };
     case 'RowAdded':
-      return s.tag === 'loaded' ? { ...s, rows: [...s.rows, emptyRow(s.table)] } : s;
+      return s.tag === 'Loaded' ? { ...s, rows: [...s.rows, emptyRow(s.table)] } : s;
     case 'RowRemoved':
-      return s.tag === 'loaded' ? { ...s, rows: s.rows.filter((_, i) => i !== m.row) } : s;
+      return s.tag === 'Loaded' ? { ...s, rows: s.rows.filter((_, i) => i !== m.row) } : s;
     case 'Seed':
       return m.state;
     default: