v0.4.0 — API Platform 5, LTS line kept

API Platform 5, with the LTS line kept

API Platform 5.0 shipped on 2026-09-17. The library now targets it and keeps
the versions Symfony LTS users run:

API Platform	Symfony	Role
5.0	7.4 LTS / 8.x	target: examples are written for it
4.4	7.4 LTS / 8.x	4 to 5 bridge, deltas flagged inline
4.3	6.4 LTS / 7.x / 8.x	last release supporting Symfony 6.4 LTS
3.4	6.4 / 7.1+	legacy, existing notes kept

• Every API Platform reference opens with this compatibility note.
• filters: #[ApiFilter], the SearchFilter family and AbstractFilter
  are deprecated since 4.4; migration table, api:upgrade-filter, and the
  version each filter class appeared in.
• dto-resources: ObjectMapperProcessor is removed in 5.0; the Object
  Mapper needs Symfony 7.3+, so Symfony 6.4 LTS keeps manual mapping.
• tests: ApiTestCase moved to api-platform/test in 5.0
  (ApiPlatform\Test), alwaysBootKernel defaults to false, and type errors
  on constrained properties return 422 instead of 400.
• resources: version matrix, ~4.3.0 pinning for Symfony 6.4 LTS, and the
  Query operation, throwOnNotFound, routePriority, %param% and
  OpenAPI 3.2 additions.
• The api-platform-builder and symfony-reviewer agents check the installed
  version before using or flagging an API.

Fixed

• api-platform-security: the JWT setup names
  lexik/jwt-authentication-bundle and adds the json_login firewall that
  issues the token.
• api-platform-dto-resources: read_data is documented as 4.0+ (absent
  in 3.4) and only set when the operation reads.
• doctrine-migrations: targets bundle 4.0 with library 3.9 (the library
  4.0 branch is unreleased), and the install no longer pins the bundle to
  ^3.0.
• doctrine-fetch-modes: the duplicated batch section points to
  doctrine-batch-processing.