Merge pull request #358 from athola/gaunlet-1.8.0

fix(gauntlet): use enums for challenge types, consolidate docs

docs: update marketplace, capabilities, and changelog for v1.8.0

feat(imbue): add tome research enrichment to feature-review

fix(gauntlet,oracle): address PR #358 review findings

docs: add ONNX integration research, specs, and plans

feat(gauntlet): auto-detect oracle sidecar and upgrade scoring

feat(oracle): add /oracle:setup command for user-initiated provisioning

feat(oracle): add HTTP client with graceful degradation

feat(oracle): create plugin skeleton with marketplace-safe structure

feat(oracle): add venv provisioning with uv and onnxruntime

fix(gauntlet): use configurable blend weights and test ML fallback path

feat(gauntlet): export score_answer_quality from package root

feat(gauntlet): integrate ML scoring into evaluate_answer()

feat(gauntlet): add score_answer_quality() public API