Phase 2 sub-commit 2: ModelPublisher + #[BridgeResource] + Doctrine listener

Bundle gains the model layer that bridges Doctrine entities to Mercure
without per-resource glue. Three new pieces:

- `#[BridgeResource(name: ?string)]` attribute marks an entity as a
  reactive bridge model. Topic name defaults to the lowercased class
  basename and can be overridden per resource.

- `ModelPublisher` translates entity changes into PLAN.md §4 envelopes
  ({op, id, data, version, ?correlationKey}) and dual-publishes them
  on `app://model/{name}` (collection topic) and `app://model/{name}/{id}`
  (entity topic). Entity normalisation goes through Symfony's Serializer
  (ObjectNormalizer + DateTime + BackedEnum) for predictable JSON. The
  envelope `version` field is a per-process monotonic counter — fine for
  single-instance dev mode; production should back this with a Postgres
  SEQUENCE or equivalent (noted for Phase 4).

- `DoctrineBridgeListener` registers `postPersist`/`postUpdate`/
  `postRemove` via `#[AsDoctrineListener]` and routes events through
  ModelPublisher. Entities without `#[BridgeResource]` are silently
  skipped.

Plus the correlation-key plumbing the §5 Update Semantics layer needs:

- `CorrelationContext` is a per-request holder for the originating
  request's `Idempotency-Key`.
- `CorrelationKeyListener` reads the header on `KernelEvents::REQUEST`
  and clears the context on `KernelEvents::TERMINATE` (worker mode
  hygiene). CLI mutations see no key, which is correct.

Bundle composer.json picks up `doctrine/dbal`, `doctrine/orm`,
`doctrine/doctrine-bundle`, `symfony/serializer`, `symfony/property-*`,
`symfony/uid`. PHPStan extension `phpstan-doctrine` added so the listener's
event-args types resolve. Skeleton's framework.yaml enables `serializer`
and `property_info`.

Tests: 5 new for ModelPublisher (dual publish, correlation echo, delete
op omits data, untagged entities ignored, version increments). Total:
16 tests, 45 assertions, PHPStan clean, cs-fixer clean.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

framework/skeleton/symfony/composer.lock

@@ -1199,9 +1199,12 @@
             "dist": {
                 "type": "path",
                 "url": "../../php",
-                "reference": "d40b6316ce4233eef1bdfdc4be2993b12cbc0e8a"
+                "reference": "57ce5999bb54c35e1a8b61f3bd35c5247baeb730"
             },
             "require": {
+                "doctrine/dbal": "^4.0",
+                "doctrine/doctrine-bundle": "^3.0",
+                "doctrine/orm": "^3.0",
                 "php": "^8.3",
                 "symfony/config": "^8.0",
                 "symfony/console": "^8.0",
@@ -1209,12 +1212,17 @@
                 "symfony/framework-bundle": "^8.0",
                 "symfony/http-foundation": "^8.0",
                 "symfony/mercure": "^0.7",
+                "symfony/property-access": "^8.0",
+                "symfony/property-info": "^8.0",
                 "symfony/routing": "^8.0",
-                "symfony/security-bundle": "^8.0"
+                "symfony/security-bundle": "^8.0",
+                "symfony/serializer": "^8.0",
+                "symfony/uid": "^8.0"
             },
             "require-dev": {
                 "friendsofphp/php-cs-fixer": "^3",
                 "phpstan/phpstan": "^2",
+                "phpstan/phpstan-doctrine": "^2",
                 "phpstan/phpstan-symfony": "^2",
                 "phpunit/phpunit": "^11",
                 "symfony/phpunit-bridge": "^8.0"
@@ -4675,6 +4683,103 @@
             ],
             "time": "2026-03-30T15:14:47+00:00"
         },
+        {
+            "name": "symfony/serializer",
+            "version": "v8.0.8",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/symfony/serializer.git",
+                "reference": "0e3169be25dbf0c23686c8089662cee9dd714932"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/symfony/serializer/zipball/0e3169be25dbf0c23686c8089662cee9dd714932",
+                "reference": "0e3169be25dbf0c23686c8089662cee9dd714932",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=8.4",
+                "symfony/polyfill-ctype": "^1.8"
+            },
+            "conflict": {
+                "phpdocumentor/reflection-docblock": "<5.2|>=7",
+                "phpdocumentor/type-resolver": "<1.5.1",
+                "symfony/property-info": "<7.4",
+                "symfony/type-info": "<7.4"
+            },
+            "require-dev": {
+                "phpdocumentor/reflection-docblock": "^5.2|^6.0",
+                "phpstan/phpdoc-parser": "^1.0|^2.0",
+                "seld/jsonlint": "^1.10",
+                "symfony/cache": "^7.4|^8.0",
+                "symfony/config": "^7.4|^8.0",
+                "symfony/console": "^7.4|^8.0",
+                "symfony/dependency-injection": "^7.4|^8.0",
+                "symfony/error-handler": "^7.4|^8.0",
+                "symfony/filesystem": "^7.4|^8.0",
+                "symfony/form": "^7.4|^8.0",
+                "symfony/http-foundation": "^7.4|^8.0",
+                "symfony/http-kernel": "^7.4|^8.0",
+                "symfony/messenger": "^7.4|^8.0",
+                "symfony/mime": "^7.4|^8.0",
+                "symfony/property-access": "^7.4|^8.0",
+                "symfony/property-info": "^7.4|^8.0",
+                "symfony/translation-contracts": "^2.5|^3",
+                "symfony/type-info": "^7.4|^8.0",
+                "symfony/uid": "^7.4|^8.0",
+                "symfony/validator": "^7.4|^8.0",
+                "symfony/var-dumper": "^7.4|^8.0",
+                "symfony/var-exporter": "^7.4|^8.0",
+                "symfony/yaml": "^7.4|^8.0"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "Symfony\\Component\\Serializer\\": ""
+                },
+                "exclude-from-classmap": [
+                    "/Tests/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Fabien Potencier",
+                    "email": "fabien@symfony.com"
+                },
+                {
+                    "name": "Symfony Community",
+                    "homepage": "https://symfony.com/contributors"
+                }
+            ],
+            "description": "Handles serializing and deserializing data structures, including object graphs, into array structures or other formats like XML and JSON.",
+            "homepage": "https://symfony.com",
+            "support": {
+                "source": "https://github.com/symfony/serializer/tree/v8.0.8"
+            },
+            "funding": [
+                {
+                    "url": "https://symfony.com/sponsor",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://github.com/fabpot",
+                    "type": "github"
+                },
+                {
+                    "url": "https://github.com/nicolas-grekas",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/symfony/symfony",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2026-03-31T07:15:36+00:00"
+        },
         {
             "name": "symfony/service-contracts",
             "version": "v3.6.1",

framework/skeleton/symfony/config/packages/framework.yaml

@@ -6,4 +6,8 @@ framework:
         log: true
     router:
         utf8: true
+    serializer:
+        enabled: true
+    property_info:
+        enabled: true
     test: false