0.1.8

✅ Key New Features

• Large-input sampling added via content_processing.sample (head/middle/footer ratios + max token budget).
• Sample debug output file support added to write sampled content for inspection.
• New sample repo example added at examples/sample_25_50_25/ (agent config, 6000+ token input, usage README).

🛠️ Improvements & Stabilization

• Added advanced model request controls: extra_headers and extra_body in model/runtime settings.
• Added runtime metrics capture for model calls (usage/model/response metadata).
• Updated runtime flow to apply sampling before normal chain execution, with supporting model/spec wiring.

🧪 Testing & Quality

• Added dedicated sampler test suite (test_sample_ratios.py) and expanded orchestrator coverage.
• Extended tests for HTTP/model settings and metrics behavior.
• CI workflow updated (.github/workflows/tests.yml).

📚 Documentation & Templates

• Added advanced docs (docs/advanced.md) for extra_headers/extra_body.
• Added sample feature docs (docs/sample.md) with configuration and run instructions.
• Updated README.md to include links to sample docs and advanced docs.

Full Changelog: 0.1.7...0.1.8