test(performance): accept multi-segment test-only suffixes in the zoneless guard

Review follow-up (Greptile): `(-\w+)?` allowed one suffix segment, so a
file such as `rail.test-data-stubs.ts` would be scanned as production.
The suffix now repeats, and a classifier test pins which names are
skipped and which ship.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docs/architecture/zoneless-migration.md

@@ -154,8 +154,9 @@ files that still contain `ChangeDetectionStrategy.Eager`.
 - [ ] `libs/portal/xtream/feature/src/lib/serial-details/serial-details.component.ts`
 
 Test-only files that set Eager are not listed; they do not ship. The guard
-skips every `*.spec.ts` / `*.test.ts` file with or without a suffix
-(`*.spec-stubs.ts`, `*.test-helpers.ts`, `*.test-stubs.ts`, …),
+skips every `*.spec.ts` / `*.test.ts` file with or without a suffix of one
+or more segments (`*.spec-stubs.ts`, `*.test-helpers.ts`,
+`*.test-data-stubs.ts`, …),
 `test-setup.ts` and `test-stubs/` directories.
 
 ## Zone-dependent sites