Add Claude Code GitHub Workflow (#47)

* Add Claude PR Assistant workflow
* Add CLAUDE.md

Author: abrookins

.github/workflows/claude.yml

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+name: Claude Code
+
+on:
+  issue_comment:
+    types: [created]
+  pull_request_review_comment:
+    types: [created]
+  issues:
+    types: [opened, assigned]
+  pull_request_review:
+    types: [submitted]
+
+jobs:
+  claude:
+    if: |
+      (github.event_name == 'issue_comment' && contains(github.event.comment.body, '@claude')) ||
+      (github.event_name == 'pull_request_review_comment' && contains(github.event.comment.body, '@claude')) ||
+      (github.event_name == 'pull_request_review' && contains(github.event.review.body, '@claude')) ||
+      (github.event_name == 'issues' && (contains(github.event.issue.body, '@claude') || contains(github.event.issue.title, '@claude')))
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      pull-requests: read
+      issues: read
+      id-token: write
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 1
+
+      - name: Run Claude Code
+        id: claude
+        uses: anthropics/claude-code-action@beta
+        with:
+          anthropic_api_key: ${{ secrets.ANTHROPIC_API_KEY }}
+

CLAUDE.md

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+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## Development Commands
+
+### Setup and Dependencies
+```bash
+make install          # Install all dependencies with poetry
+make redis-start      # Start Redis Stack container (includes RedisJSON and RediSearch)
+make redis-stop       # Stop Redis container
+```
+
+### Testing
+```bash
+make test            # Run tests with verbose output
+make test-all        # Run all tests including API tests
+pytest tests/test_specific.py  # Run specific test file
+pytest tests/test_specific.py::test_function  # Run specific test
+pytest --run-api-tests  # Include API integration tests
+```
+
+### Code Quality
+```bash
+make lint            # Format code and run type checking
+make format          # Format code with black and isort
+make check-types     # Run mypy type checking
+make check           # Run both linting and tests
+```
+
+### Development
+```bash
+make clean           # Remove cache and build artifacts
+```
+
+## Architecture Overview
+
+### Core Components
+
+**Checkpoint Savers** (`langgraph/checkpoint/redis/`):
+- `base.py`: `BaseRedisSaver` - Abstract base class with shared Redis operations, schemas, and TTL management
+- `__init__.py`: `RedisSaver` - Standard sync implementation 
+- `aio.py`: `AsyncRedisSaver` - Async implementation
+- `shallow.py` / `ashallow.py`: Shallow variants that store only latest checkpoint
+
+**Stores** (`langgraph/store/redis/`):
+- `base.py`: `BaseRedisStore` - Abstract base with Redis operations, vector search, and TTL support
+- `__init__.py`: `RedisStore` - Sync store with key-value and vector search
+- `aio.py`: `AsyncRedisStore` - Async store implementation
+
+### Key Architecture Patterns
+
+**Dual Implementation Strategy**: Each major component has both sync and async variants that share common base classes. The base classes (`BaseRedisSaver`, `BaseRedisStore`) contain the bulk of the business logic, while concrete implementations handle Redis client management and specific I/O patterns.
+
+**Redis Module Dependencies**: The library requires RedisJSON and RediSearch modules. Redis 8.0+ includes these by default; earlier versions need Redis Stack. All operations use structured JSON storage with search indices for efficient querying.
+
+**Schema-Driven Indexing**: Both checkpoints and stores use predefined schemas (`SCHEMAS` constants) that define Redis Search indices. Checkpoint indices track thread/namespace/version hierarchies; store indices support both key-value lookup and optional vector similarity search.
+
+**TTL Integration**: Native Redis TTL support is integrated throughout, with configurable defaults and refresh-on-read capabilities. TTL applies to all related keys (main document, vectors, writes) atomically.
+
+**Cluster Support**: Full Redis Cluster support with automatic detection and cluster-aware operations (individual key operations vs. pipelined operations).
+
+**Type System**: Heavy use of generics (`BaseRedisSaver[RedisClientType, IndexType]`) to maintain type safety across sync/async variants while sharing implementation code.
+
+### Redis Key Patterns
+- Checkpoints: `checkpoint:{thread_id}:{namespace}:{checkpoint_id}`
+- Checkpoint blobs: `checkpoint_blob:{thread_id}:{namespace}:{channel}:{version}`
+- Checkpoint writes: `checkpoint_write:{thread_id}:{namespace}:{checkpoint_id}:{task_id}`
+- Store items: `store:{uuid}`
+- Store vectors: `store_vectors:{uuid}`
+
+### Testing Strategy
+Tests are organized by functionality:
+- `test_sync.py` / `test_async.py`: Core checkpoint functionality
+- `test_store.py` / `test_async_store.py`: Store operations
+- `test_cluster_mode.py`: Redis Cluster specific tests
+- `test_*_ttl.py`: TTL functionality
+- `test_key_parsing.py`: Key generation and parsing logic
+- `test_semantic_search_*.py`: Vector search capabilities
+
+### Important Dependencies
+- Requires Redis with RedisJSON and RediSearch modules
+- Uses `redisvl` for vector operations and search index management
+- Uses `python-ulid` for unique document IDs
+- Integrates with LangGraph's checkpoint and store base classes