test(spec): pin PageContainerProps as isomorphic for the ADR-0122 phase-2 flip (#5775)

`check:spec-parsed-alias` (the phase-1 gate from #6072) refuses a bare
`X = z.infer<typeof XSchema>` alias that is neither paired with an `XParsed`
nor pinned as isomorphic. `PageContainerProps` is a lone optional array with no
default, transform, catch or pipe anywhere in its tree, so `z.input` and
`z.infer` coincide and the phase-2 flip of the bare name changes nothing
observable — which is the pin route, not the `XParsed` route (a permanent
synonym is a name an author can only pick wrongly).

`component.zod.ts` had no bare alias until now, so this adds the file's first
module import to the registry. It takes the next free M-index rather than the
alphabetical slot: those indices are positional identifiers the 720 pin lines
reference by number.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01AwTBGD3gTnPKWmJLYU9R7T

Author: claude

packages/spec/src/type-alias-convention.pin.test.ts

@@ -241,6 +241,12 @@ import type * as M165 from './ui/responsive.zod.js';
 import type * as M166 from './ui/theme.zod.js';
 import type * as M167 from './ui/view.zod.js';
 import type * as M168 from './ui/widget.zod.js';
+// Appended out of alphabetical order deliberately: the M-indices are positional
+// identifiers the pin lines below reference by number, so a new module takes the
+// next free index rather than renumbering 169 imports and every pin that names
+// one. #5775 is the first entry from this file — `component.zod.ts` had no bare
+// `X = z.infer` alias until `PageContainerProps` arrived.
+import type * as M170 from './ui/component.zod.js';
 
 // ---------------------------------------------------------------------------
 // 717 isomorphic aliases: `z.input` === `z.infer`, so no `XParsed` is declared.
@@ -1316,6 +1322,14 @@ export type Iso715 = Assert<Eq< z.input< typeof M167.UserFilterFieldSchema >, z.
 // ui/widget.zod.ts
 export type Iso716 = Assert<Eq< z.input< typeof M168.WidgetLifecycleSchema >, z.infer< typeof M168.WidgetLifecycleSchema > >>;
 
+// ui/component.zod.ts
+// #5775 — the shared `children` contract for `page:section`/`page:footer`/
+// `page:sidebar`. A lone optional array with no default, transform, catch or
+// pipe anywhere in its tree, so the two shapes coincide and the phase-2 flip of
+// the bare name changes nothing. `check:spec-parsed-alias` sent it here rather
+// than to a `PageContainerPropsParsed`, which would be a permanent synonym.
+export type Iso719 = Assert<Eq< z.input< typeof M170.PageContainerProps >, z.infer< typeof M170.PageContainerProps > >>;
+
 // ---------------------------------------------------------------------------
 // Representative spot-checks on the phase-1 ADDITIONS.
 //
@@ -1371,7 +1385,7 @@ export type AFamilyParsedIsParseState = Assert<
 // ---------------------------------------------------------------------------
 
 describe('ADR-0122 type-alias convention', () => {
-  it('still declares all 719 isomorphic pins', () => {
+  it('still declares all 720 isomorphic pins', () => {
     // The truth of each pin is proved by tsc, not here — an `Assert<Eq<...>>`
     // that stops holding is a compile error with the alias named. What tsc
     // cannot notice is a pin that was DELETED: removing the assertion removes
@@ -1390,7 +1404,7 @@ describe('ADR-0122 type-alias convention', () => {
     // `ConnectorType` / `ConnectorStatus` pins beside it).
     const self = readFileSync(fileURLToPath(import.meta.url), 'utf8');
     const pins = self.match(/^export type Iso\d+ = Assert</gm) ?? [];
-    expect(pins).toHaveLength(719);
+    expect(pins).toHaveLength(720);
   });
 
   it('leaves the A-family parse behaviour untouched', () => {