Add CHANGELOG.md for v0.1.2 release

Author: moonstripe

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [0.1.2] - 2026-02-05
+
+### Added
+- **HFEmbedder**: Local transformer model support via Candle
+  - Downloads models from HuggingFace Hub with caching
+  - Supports sentence-transformers and BERT-compatible models
+  - Respects `HF_HOME` and `HF_TOKEN` environment variables
+  - Mean pooling and normalization for quality embeddings
+  - Examples: all-MiniLM-L6-v2, all-mpnet-base-v2, bge-small-en-v1.5
+  
+- **ApiEmbedder**: External embedding API support
+  - OpenAI (text-embedding-3-small, text-embedding-3-large)
+  - Cohere (embed-english-v3.0, embed-multilingual-v3.0)
+  - Voyage AI (voyage-3, voyage-3-lite, voyage-code-3)
+  - Custom OpenAI-compatible endpoints
+  - Efficient batch embedding operations
+  
+- **Optional Features**: Keep binary small with opt-in features
+  - `hf-embeddings`: Enable HuggingFace local models
+  - `api-embeddings`: Enable external API providers
+  - Default build has zero embedding dependencies
+
+- **Comprehensive Documentation**
+  - `EMBEDDINGS.md`: Complete guide to all embedding options
+  - Comparison tables, setup instructions, performance tips
+  - `examples/embeddings.rs`: Working examples for all embedders
+  - `tests/README.md`: Integration test guide
+
+- **Integration Test Suite**
+  - Auto-skips in CI (no network downloads, no timeouts)
+  - Local tests run with cached models only
+  - Explicit download tests available
+  - Model cache detection and listing utilities
+
+### Changed
+- Updated README with embedding examples and feature flags
+- Split CI test runs for better clarity (lib + integration tests)
+
+### Fixed
+- All existing tests continue to pass (59 unit tests)
+- No breaking changes to public API
+
+## [0.1.1] - 2026-02-04
+
+### Added
+- GitHub Actions workflows for CI/CD
+  - Continuous Integration: test, clippy, format checks
+  - Release workflow: cross-platform binary builds (9 targets)
+  - Automated releases on version tags
+
+### Changed
+- Updated README with binary installation instructions
+- Added prebuilt binary download examples
+
+## [0.1.0] - 2026-02-04
+
+### Added
+- Initial release of indra_db
+- Content-addressed graph database with git-like versioning
+- Thought nodes with embeddings
+- Typed/weighted edges
+- Commit history and branching
+- MockEmbedder for deterministic testing
+- CLI tool (`indra`) with JSON output
+- Single-file database format with BLAKE3 hashing
+- Merkle trie for structural sharing
+- Vector similarity search
+- Graph traversal operations (neighbors, BFS, shortest path)
+- Complete test suite (54 tests)
+
+[0.1.2]: https://github.com/moonstripe/indra_db/compare/v0.1.1...v0.1.2
+[0.1.1]: https://github.com/moonstripe/indra_db/compare/v0.1.0...v0.1.1
+[0.1.0]: https://github.com/moonstripe/indra_db/releases/tag/v0.1.0