Minor release: `/api/v2` API prefix (v1 retained as alias) and native
OpenTelemetry tracing — both back-compatible, so 1.1.4 -> 1.2.0.
- pyproject: version 1.1.4 -> 1.2.0
- CHANGELOG: promote [Unreleased] to [1.2.0]
- docs/openapi.json + uv.lock: regenerated for the new version
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>