[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

demo/composer.json

@@ -8,7 +8,7 @@
         "ext-ctype": "*",
         "ext-gd": "*",
         "ext-iconv": "*",
-        "codewithkyrian/chromadb-php": "^0.4.0",
+        "symfony/ai-chromadb-store": "@dev",
         "league/commonmark": "^2.7.1",
         "mrmysql/youtube-transcript": "^0.0.5",
         "php-http/discovery": "^1.20",

examples/composer.json

@@ -19,14 +19,18 @@
         {
             "type": "path",
             "url": "../src/store"
+        },
+        {
+            "type": "path",
+            "url": "../src/store/src/Bridge/ChromaDb"
         }
     ],
     "require": {
         "php": ">=8.2",
         "ext-pdo": "*",
         "ext-redis": "*",
         "async-aws/bedrock-runtime": "^1.1",
-        "codewithkyrian/chromadb-php": "^0.4.0",
+        "symfony/ai-chromadb-store": "@dev",
         "codewithkyrian/transformers": "^0.6.2",
         "doctrine/dbal": "^3.3|^4.0",
         "google/auth": "^1.47",

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