refactor: rename Embedder to Indexer and open input to iterable

[chr-hertel]

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[Copilot]

Pull Request Overview

This PR refactors the embedding service by renaming Embedder to Indexer, updates its API to accept any iterable of documents, and propagates those changes through tests, examples, and documentation.

• Renamed class and methods: Embedder::embed() → Indexer::index()
• Expanded input type from array to iterable<TextDocument> in constructor and docblocks
• Updated all tests, example scripts, and the README to use the new class and method names

Reviewed Changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
tests/Store/IndexerTest.php	Renamed test class, attributes, and calls from Embedder → Indexer
tests/Platform/Vector/VectorTest.php	Corrected namespace to match directory Platform\Vector
tests/Platform/Vector/NullVectorTest.php	Corrected namespace to match directory Platform\Vector
src/Store/Indexer.php	Renamed class, method signatures, and docblocks for iterable
examples/store/pinecone-similarity-search.php	Updated example script to use Indexer::index()
examples/store/mongodb-similarity-search.php	Updated example script to use Indexer::index()
README.md	Updated README references and code snippet for Indexer

Comments suppressed due to low confidence (1)

tests/Store/IndexerTest.php:67

• The debug message still refers to 'embed', but the class and method have been renamed to 'Indexer'. Update this to 'No documents to index' for consistency.

        $logger->expects(self::once())->method('debug')->with('No documents to embed');