docs: generate each subsystem's cordis surface into its own page; delete the flat catalogs

Rebuild of the region machinery (PR3) on the post-#904 Typert projection:
renderPageRegion/renderInheritedPage live in dsh-typert-generator beside the
projection; scripts/gen-cordis-catalog.ts owns the curated SERVICE_PAGE /
EVENT_SCOPE_PAGE / SERVICE_WALK_EXEMPTIONS / LINK_MAP partition (fail-loud in
both directions, with the independent Context-merge scan backstopping the
projection's blind spot), spliceRegion, and the guarded pair auto-record.
docs/cordis-catalog/ is deleted: the flat events/services catalogs dissolve
into per-page regions and docs/cordis-catalog/core moves to docs/cordis-api/
with the inherited tier as its own generated page. The partition absorbs the
post-regrouping surface: ctx.typert → invariants.md, ctx.directoryPicker →
workspace.md, skills/* events → skills.md, and the four launcher-provided tui
accessor values join the named exemptions.

scripts/verify-translation-pairing.ts

@@ -23,6 +23,7 @@ import {
   parseTranslationMarkdown,
   parseTranslationPairingCliArgs,
   parseTranslationPairingManifest,
+  partitionGeneratedRegions,
   isTranslationScopeFile,
   TRANSLATION_SCOPE_GLOB_EXCLUDES,
   translationStructureDiff,
@@ -227,6 +228,27 @@ for (const source of [...pairAnchors].sort()) {
     continue
   }
 
+  // Generated regions are language-invariant: the exact same generator output
+  // (markers included) must appear in both sides, in the same order. The
+  // structural signature below compares the region content again as part of
+  // the whole document; this dedicated check exists to name the divergence
+  // precisely and to reject a region grammar violation on either side.
+  let sourceRegions: { regions: string[]; stripped: string }
+  let zhRegions: { regions: string[]; stripped: string }
+  try {
+    sourceRegions = partitionGeneratedRegions(sourceContent.toString('utf8'))
+    zhRegions = partitionGeneratedRegions(zhContent.toString('utf8'))
+  } catch (error) {
+    errors.push(`${source} ↔ ${zh}: ${error instanceof Error ? error.message : String(error)}`)
+    state.set(source, 'out-of-sync')
+    continue
+  }
+  if (sourceRegions.regions.length !== zhRegions.regions.length
+    || sourceRegions.regions.some((region, index) => region !== zhRegions.regions[index])) {
+    errors.push(`${source} ↔ ${zh}: generated regions differ between the pair — regenerate (the generator writes both sides byte-identically)`)
+    state.set(source, 'out-of-sync')
+  }
+
   const sourceTree = parseTranslationMarkdown(sourceContent.toString('utf8'))
   const zhTree = parseTranslationMarkdown(zhContent.toString('utf8'))
   if (!linksTo(zhTree, basename(source))) {