* feat: add LangGraph integration with tools, nodes, and store patterns Add hindsight-langgraph SDK providing three integration patterns: - Tools: retain/recall/reflect as LangChain tools for ReAct agents - Nodes: automatic memory injection and storage as graph steps - Store: LangGraph BaseStore implementation for checkpoint-based memory Fix: remove `from __future__ import annotations` in nodes.py which prevented LangGraph from passing RunnableConfig to node functions (runtime type inspection saw string annotations instead of actual types). Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com> * chore: register langgraph with independent versioning system - Set version to 0.1.0 (integrations are versioned independently) - Add langgraph to VALID_INTEGRATIONS in release-integration.sh - Add changelog page for langgraph integration Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com> * chore: remove manual cookbook recipe page The sync-cookbook script will auto-generate this from the notebook in hindsight-cookbook once PR #17 is merged. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com> * fix: comprehensive improvements to langgraph integration Code fixes: - Retain node only stores latest messages instead of all history (prevents duplicates) - Handle multimodal msg.content (list type) in nodes - Fix store docstring separator "/" → "." - Apply search filters before pagination in store - Add ttl parameter to store.aput for LangGraph BaseStore compat - Fix _ensure_bank to not cache failed bank creations - Fix falsy value bugs (or → is not None) in tools - Remove from __future__ import annotations from all files - Consistent default budget="mid" across tools/nodes/store - Bump langgraph floor to >=0.3.0, remove duplicate dev deps Docs fixes: - Fix broken Cloud client example (base_url is required) - Complete API reference tables with all parameters - Add Limitations and Notes section (async-only store, etc.) - Add Requirements section - Fix broken cookbook link and Cloud claim in blog post All 61 unit tests pass. E2E tested against Hindsight Cloud: tools, nodes, store, configure(), multimodal content. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com> * chore: remove blog post (lives in hindsight-marketing-content) Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com> * chore: remove Hindsight Cloud section from langgraph docs Keep OSS docs self-hosted-first, consistent with other integration docs (crewai, pydantic-ai, agno). Cloud setup details live in the cookbook notebooks. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com> * docs: explicitly mention LangChain compatibility in langgraph integration The tools pattern (create_hindsight_tools) only depends on langchain-core and works with plain LangChain via bind_tools() — no LangGraph required. Update docs to make this clear with both LangGraph and LangChain quick start examples. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com> * fix: address PR review findings 1. Guard manual test files with if __name__ == "__main__" so pytest doesn't collect and execute them during test runs 2. Remove semantic fallback in HindsightStore.aget() — only return exact document_id matches, not unrelated semantic search hits 3. Make langgraph an optional dependency — tools pattern only needs langchain-core. Install with pip install hindsight-langgraph[langgraph] for nodes and store patterns. Lazy imports with clear error messages. 4. Clean up README to be self-hosted-first, consistent with other integration docs 5. Update docs requirements section to reflect optional langgraph dep Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com> * fix: address PR review feedback for langgraph integration - Fix #2: Add per-bank asyncio.Lock to _ensure_bank for concurrency safety - Fix #3: Clamp search score to max(0.0, ...) to prevent negative values - Fix #4: Implement suffix matching in _handle_list_namespaces - Fix #5: Truncate namespaces to max_depth instead of filtering (per BaseStore contract) - Fix #6: Remove list_namespaces/alist_namespaces overrides — let base class handle prefix=/suffix= kwargs - Fix #7: Document ephemeral namespace tracking and get() limitations in class docstring - Fix #8: Add stable ID to recall node SystemMessage, document ordering behavior - Fix #9: Change budget/max_tokens/recall_tags_match defaults to None so global config fallback works - Fix #10: Conditionally populate __all__ so import * works without langgraph installed - Fix #11: Bump langgraph lower bound from >=0.3.0 to >=0.5.0 - Fix #12: Extract _resolve_client to shared _client.py module Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com> * fix: address remaining review gaps for langgraph integration - Add output_key parameter to create_recall_node for prompt ordering control - Add prefix/suffix/combined filter tests for list_namespaces - Add output_key unit tests (memory text, none on empty, none on error) - Remove unused imports and backward-compat alias in tools.py - Update docs with output_key usage example and API reference Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com> * fix: relax langgraph version constraint to >=0.3.0 Research confirmed all required APIs (BaseStore, SearchItem, Result, GetOp, PutOp, SearchOp, ListNamespacesOp) are available since langgraph-checkpoint 2.0.7, which maps to langgraph >=0.2.63. Using >=0.3.0 as a clean semver boundary — >=0.5.0 was unnecessarily conservative and excluded many compatible versions. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com> --------- Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

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