Add RAGAS DeepEval and Python OTLP hooks

[haasonsaas]

Summary

• Add RAGAS and DeepEval conversion adapters with provenance, evidence hashes, RAG metrics, failed-metric warnings, and root exports.
• Upgrade the Python package from contract-only scaffold to an optional OTLP emitter with content events, env-driven sampling/PII redaction, and provider instrumentation handles.
• Refresh README and contract docs for the expanded framework and Python surfaces.

Test plan

• npm run lint
• npm run build
• npx tsc --noEmit
• npm test -- --coverage
• npm audit --omit=dev
• PYTHONPATH=python python3 -m unittest discover -s python/tests
• npm pack --dry-run
• CI=true OTEL_EXPORTER_OTLP_PROTOCOL=http/protobuf bash test-harness/run-tests.sh

Closes #4
Refs #2

[github-actions]

Package	Line Rate	Branch Rate	Complexity	Health
src	96%	83%	0	✔
src.integrations	95%	75%	0	✔
Summary	96% (1122 / 1171)	81% (900 / 1107)	0	✔

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	pypi/​anthropic@​0.102.0
	pypi/​openai@​2.37.0
	pypi/​opentelemetry-api@​1.41.1
	pypi/​cohere@​6.1.0
	pypi/​opentelemetry-sdk@​1.41.1
	pypi/​opentelemetry-exporter-otlp@​1.41.1

View full report