feat: catalog shared contracts (Tasks 1-4)

Task 1: Establish catalog identity and atomic file ownership
- CatalogService, CatalogServiceInterface, ModelMetadata DTO
- PdoCatalogRepository with atomic operations, savepoint support
- FOR UPDATE file locks in ascending order, FOR NO KEY UPDATE for metadata
- FK-compatible lock composition documented (spec §6)

Task 2: M3 import & indexing engine delivery layer
- ImportService, ImportWorker with durable collision handling
- SpaceChecker, StreamingHasher, VerifiedCopier, StlValidator
- FileEnumerator, LocalFilesystem, PathSafety
- Console command wiring via ContainerWiringTest

Task 3: Importer integration and repair
- LegacyGuessedImportGroupingAdapter isolates first-directory guessing
- ImportService uses adapter; ImportWorker uses CatalogServiceInterface
- Null owners remain null; DomainException mapped to CATALOG_CONFLICT
- SQL failure after registration/path update with caller sentinel rollback

Task 4: PostgreSQL contention evidence and bounded acceptance
- 6 new PostgresCatalogContractsTest cases with independent sessions
- Generated schemas, 250ms lock timeouts, 5s statement timeouts
- Ascending file locks, FOR SHARE contention, stale-owner rejection
- Rollback/retry, nested transaction survival, root creation contention
- Negative controls: replay FOR UPDATE removal (11 failures), metadata FOR UPDATE (4 FK KEY SHARE timeouts)
- Fresh Docker PostgreSQL 17 / PHP 8.4.26: 473 tests, 2718 assertions, 10 skips, exit 0

All local: 474 tests, 2347 assertions, 54 skips, foundation/lint clean.

tests/Integration/RepositoryTest.php

@@ -52,7 +52,7 @@ final class RepositoryTest extends TestCase
         $file = $catalog->recordFile($model, 'vehicles/aircraft/wing.stl', str_repeat('a', 64), 12, 'model/stl');
         self::assertSame($file, $catalog->recordFile($model, 'vehicles/aircraft/wing.stl', str_repeat('a', 64), 12));
         foreach (['Missing', 'Updated', 'Duplicate', 'Present'] as $status) {
-            $catalog->setFileStatus($file, $status);
+            $catalog->changeFileStatus($file, $catalog->file($file)['status'], $status);
             self::assertSame($status, $catalog->aggregate($model)['files'][0]['status']);
         }
         $aggregate = $catalog->aggregate($model);