[Store][ChromaDb] Split ChromaDb store as dedicated package

Similar to how tools were split in the Agent component, this extracts the ChromaDb store into its own standalone package with:
- Independent composer.json with proper dependencies
- Dedicated test suite with phpunit.xml.dist
- Standard package files (LICENSE, README.md, CHANGELOG.md)
- GitHub integration files for subtree split workflow

Author: OskarStark

src/store/src/Bridge/ChromaDb/.gitattributes

@@ -0,0 +1,3 @@
+/Tests export-ignore
+/phpunit.xml.dist export-ignore
+/.git* export-ignore

src/store/src/Bridge/ChromaDb/.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,8 @@
+Please do not submit any Pull Requests here. They will be closed.
+---
+
+Please submit your PR here instead:
+https://github.com/symfony/ai
+
+This repository is what we call a "subtree split": a read-only subset of that main repository.
+We're looking forward to your PR there!

src/store/src/Bridge/ChromaDb/.github/close-pull-request.yml

@@ -0,0 +1,20 @@
+name: Close Pull Request
+
+on:
+  pull_request_target:
+    types: [opened]
+
+jobs:
+  run:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: superbrothers/close-pull-request@v3
+      with:
+        comment: |
+          Thanks for your Pull Request! We love contributions.
+
+          However, you should instead open your PR on the main repository:
+          https://github.com/symfony/ai
+
+          This repository is what we call a "subtree split": a read-only subset of that main repository.
+          We're looking forward to your PR there!

src/store/src/Bridge/ChromaDb/.gitignore

@@ -0,0 +1,4 @@
+vendor/
+composer.lock
+phpunit.xml
+.phpunit.result.cache

src/store/src/Bridge/ChromaDb/CHANGELOG.md

@@ -0,0 +1,7 @@
+CHANGELOG
+=========
+
+0.1
+---
+
+ * Add the bridge

src/store/src/Bridge/ChromaDb/LICENSE

@@ -0,0 +1,19 @@
+Copyright (c) 2025-present Fabien Potencier
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is furnished
+to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

src/store/src/Bridge/ChromaDb/README.md

@@ -0,0 +1,12 @@
+ChromaDB Store
+==============
+
+Provides [ChromaDB](https://www.trychroma.com/) vector store integration for Symfony AI Store.
+
+Resources
+---------
+
+ * [Contributing](https://symfony.com/doc/current/contributing/index.html)
+ * [Report issues](https://github.com/symfony/ai/issues) and
+   [send Pull Requests](https://github.com/symfony/ai/pulls)
+   in the [main Symfony AI repository](https://github.com/symfony/ai)

src/store/src/Bridge/ChromaDb/Store.php

@@ -15,7 +15,6 @@
 use Symfony\AI\Platform\Vector\Vector;
 use Symfony\AI\Store\Document\Metadata;
 use Symfony\AI\Store\Document\VectorDocument;
-use Symfony\AI\Store\Exception\RuntimeException;
 use Symfony\AI\Store\StoreInterface;
 use Symfony\Component\Uid\Uuid;
 
@@ -28,9 +27,6 @@ public function __construct(
         private readonly Client $client,
         private readonly string $collectionName,
     ) {
-        if (!class_exists(Client::class)) {
-            throw new RuntimeException('For using the ChromaDB as retrieval vector store, the codewithkyrian/chromadb-php package is required. Try running "composer require codewithkyrian/chromadb-php".');
-        }
     }
 
     public function add(VectorDocument ...$documents): void

src/store/tests/Bridge/ChromaDb/StoreTest.php renamed to src/store/src/Bridge/ChromaDb/Tests/StoreTest.php

@@ -9,7 +9,7 @@
  * file that was distributed with this source code.
  */
 
-namespace Symfony\AI\Store\Tests\Bridge\ChromaDb;
+namespace Symfony\AI\Store\Bridge\ChromaDb\Tests;
 
 use Codewithkyrian\ChromaDB\Client;
 use Codewithkyrian\ChromaDB\Generated\Responses\QueryItemsResponse;

src/store/src/Bridge/ChromaDb/composer.json

@@ -0,0 +1,59 @@
+{
+    "name": "symfony/ai-chromadb-store",
+    "description": "ChromaDB vector store bridge for Symfony applications.",
+    "license": "MIT",
+    "type": "symfony-ai-store",
+    "keywords": [
+        "ai",
+        "bridge",
+        "chromadb",
+        "store",
+        "vector"
+    ],
+    "authors": [
+        {
+            "name": "Christopher Hertel",
+            "email": "mail@christopher-hertel.de"
+        },
+        {
+            "name": "Oskar Stark",
+            "email": "oskarstark@googlemail.com"
+        },
+        {
+            "name": "Symfony Community",
+            "homepage": "https://symfony.com/contributors"
+        }
+    ],
+    "require": {
+        "php": ">=8.2",
+        "codewithkyrian/chromadb-php": "^0.2.1|^0.3|^0.4",
+        "symfony/ai-store": "@dev",
+        "symfony/uid": "^7.3|^8.0"
+    },
+    "require-dev": {
+        "phpunit/phpunit": "^11.5.13"
+    },
+    "minimum-stability": "dev",
+    "autoload": {
+        "psr-4": {
+            "Symfony\\AI\\Store\\Bridge\\ChromaDb\\": ""
+        }
+    },
+    "autoload-dev": {
+        "psr-4": {
+            "Symfony\\AI\\Store\\Bridge\\ChromaDb\\Tests\\": "Tests/"
+        }
+    },
+    "config": {
+        "sort-packages": true
+    },
+    "extra": {
+        "branch-alias": {
+            "dev-main": "0.x-dev"
+        },
+        "thanks": {
+            "name": "symfony/ai",
+            "url": "https://github.com/symfony/ai"
+        }
+    }
+}