feat(jpa): implement the JPA relational persistence platform

Implements the Stable and Experimental JPA persistence platform designs
against real PostgreSQL, adapted to this repository's fail-closed 19-leaf
registry.

The design models the platform as 25 Gradle projects. `src/settings.gradle`
throws unless the registry holds exactly 19 leaves, so the plan's modules
become packages inside `:adapter:outbound:persistence-jpa` (starter in
`:app-bootstrap`, testkit in its own source set). The full mapping, the
renames this repository's naming gate required, and every deliberate
substitution are recorded in `docs/jpa/repository-adaptation.md`.

Seven Docker-backed lanes replace the plan's seven JVM test suites. Each
fails closed: a lane that discovers nothing, or a container that cannot
start, is an error rather than a skip.

Three defects the contracts found against a real server:

- `CommitFailureClassifier` treated only SQLSTATE 40003, class 08, and
  transport breaks as completion-unknown. A backend terminated mid-commit
  reports 57P01, and the commit record may already be in the WAL — so a
  possibly-committed transaction could be re-run. 57P01/57P02/57P03 now
  classify as completion-unknown.
- `SchemaTenantMigrationOrchestrator` recorded `MigrateResult`'s target
  version, which is empty for a tenant already current, reporting migrated
  tenants as unmigrated during a partial rollout. It now reads the applied
  version back from the tenant's schema history.
- `JpaStreamExecutor` checked only the declared return type for reactive
  publishers, and `RegisteredPostgreSqlCopyLoader` passed the COPY timeout
  to `SET`, which is parsed before parameter binding.

`JpaModuleBoundaryTest` enforces the plan's module map as package rules;
`verifyCleanArchitectureDependencies` governs edges between leaves and
cannot see these. Its first assertion is that the import is non-empty,
because every rule under it is a `noClasses()` rule and would pass
vacuously on an empty import.

Verified: 128 container tests across all seven lanes, 1183 unit tests,
`:adapter:outbound:persistence-jpa:check`, `:app-bootstrap:check`,
`verifyCleanArchitectureDependencies`, `verifyOneTypePerFile`.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

.github/scripts/verify-gradle-wrapper.sh

@@ -24,7 +24,13 @@ readonly EXPECTED_WORKFLOW_LOCK=(
   '58e28f3358d794ca08f4aa8df4516e03f50a9ee58488b3f0d2619998e069ef14  .github/workflows/httpclient-contract.yml'
   '823bc346e58a58b2c0814cd1e3e55ec90d360c138419ec3d8f05deb59c62c7eb  .github/workflows/httpclient-nightly.yml'
   'ad84000efc438ee7439517b8f85819e62b13dab0aa4f94066c2905060f3bb581  .github/workflows/httpclient-release.yml'
+  'e0cb998969b8f4b8531f50d38413ee4640931839be7ad50509e1d0e1a84f919e  .github/workflows/jpa-next-hibernate8.yml'
+  '6f577e71cd10d74facdf76353f211132d2e2ba04363b8025affb45873f349d9f  .github/workflows/jpa-next-jpa4.yml'
+  'f69e174cd0e5a2451078ea23d52efefc13fb27d2c120f5fe30dc93ffc4d532aa  .github/workflows/jpa-next-postgresql19.yml'
+  '053593c3f1b5acdc98f01f1986ffbe74163d61c58384d16e27949b879757bef1  .github/workflows/jpa-nightly.yml'
+  '04851f44ba94533bfbc8fabe2b3a2b408726a9996e86ed3864986d1499d16b50  .github/workflows/jpa-pr.yml'
   '59cb3a0ffc687a15eefe96bc5e3a70d42be78e1cc85d2e7f7880dac6124ca4c7  .github/workflows/jpa-r2-evidence.yml'
+  'ea7f8214a3cc9ec3e7ba3183a2201fd26a05a61f0b0fdcb1f041b71efca3e81c  .github/workflows/jpa-release.yml'
   '5be7e931db749029d89787da042d6d7cf8e683d60698bd8a2993c29db26355fb  .github/workflows/link-check.yml'
   '64245586cd5936f1a5647b57f2cd9acd316f96fd75f713b1890decb812e7d5fe  .github/workflows/object-storage-qualification.yml'
   'cbc104ea486c746229895e804e3be7716e056a02cce0588c537bce9f442f8b38  .github/workflows/redis-sdk-topology.yml'