ENG-2664 Remove legacy lens and draft APIs from the Python SDK

[sahil-roe]

Retire the lens/draft SDK API as part of ENG-2664.

Remove the handwritten knowledge-base facade and its RoeClient import, initialization, and property. Regenerate the raw endpoints, models, wrapper contract, and examples from the roe-main SDK source so removing the backend lens endpoints leaves RoeClient importable.

Companion backend cleanup: roe-main #4248. Land the matching SDK cleanup before the next SDK regeneration/release from that backend change.

Self-review

Full branch diff reviewed against the merge base with main. No actionable findings or P0/P1 blockers. This intentionally removes the legacy lens/draft SDK API.

Test Plan

• uv run --locked pytest -q: 62 passed.
• Full Ruff lint and format checks passed.
• Regenerated twice with scripts/generate-sdk; no codegen drift.

[greptile-apps]

Confidence Score: 5/5

The PR appears safe to merge because the retired API surface is removed consistently and no actionable regressions remain.

Summary

This PR consistently removes the retired knowledge-base lens and draft API surface from the Python SDK.

• Removes the handwritten KnowledgeBaseAPI facade and its RoeClient integration.
• Removes corresponding OpenAPI paths, wrapper declarations, generated endpoints, and generated models.
• Removes obsolete examples and transport tests.
• Regenerates job-result models to match the current OpenAPI optionality of cost and token fields.

_{Reviews (1) · Last reviewed commit: "- Remove legacy lens and draft SDK APIs ..."}