Fix save_annotated_documents to handle string paths

feat: Add OpenAI language model support

…s: (#10)

* docs: clarify output_dir behavior in medication_examples.md

* Removed inline comment in medication example

Deleted an inline comment referencing the  output directory in the save_annotated_documents.

* docs: add output_dir="." to all save_annotated_documents examples

Prevents confusion from default `test_output/...` by explicitly saving to current directory.

* build: add formatting & linting pipeline with pre-commit integration

* style: apply pyink, isort, and pre-commit formatting

* ci: enable format and lint checks in tox

* Add LangExtractError base exception for centralized error handling

Introduces a common base exception class that all library-specific exceptions inherit from, enabling users to catch all LangExtract errors with a single except clause.

* fix(ui): prevent current highlight border from being obscured

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Co-authored-by: Leena Kamran <62442533+kleeena@users.noreply.github.com>
Co-authored-by: Akshay Goel <akshay.k.goel@gmail.com>

- Gemini & OpenAI test suites with retry on transient errors
- CI: Separate job, Python 3.11 only, skips for forks
- Validates char_interval for all extractions
- Multilingual test xfail (issue #13)

TODO: Remove xfail from multilingual test after tokenizer fix

…57)

Fixes #27

- Add quickstart example and documentation for local LLM usage
- Include Docker setup with health checks and docker-compose
- Add integration tests and update CI pipeline
- Secure setup: localhost-only binding, containerized deployment

Signed-off-by: Akshay Goel <goelak@google.com>

- Ollama integration with Docker examples
- Fixed OllamaLanguageModel parameter name (model -> model_id)
- Added CI/CD tests for Ollama
- Updated documentation with consistent API examples