[delete-cloud]

Summary

• add workspace_source.kind = git request schema with remote URL, base ref, base SHA, and optional runtime profile
• fail closed with HTTP 501 until Git-backed workspace provisioning is implemented
• ensure Git source requests do not fall through to Docker provider provisioning

Validation

• uv run pytest tests/ui/test_http_server.py -k "git_workspace_source_until_supported" -q
• uv run pytest tests/ui/test_http_server.py -k "git_workspace_source_until_supported or provisions_docker_cloud_workspace or rejects_workspace_provisioning_when_disabled or rejects_conflicting_workspace_binding_inputs or RemoteResultPublicationContract" -q
• uv run pytest tests/ui/test_http_server.py tests/ui/test_http_server_workspace_transfer.py -k "workspace_source or git_workspace or docker_cloud_workspace or workspace_transfer or RemoteResultPublicationContract" -q
• uv run basedpyright --level error src/coding_agent/ui/schemas.py src/coding_agent/ui/http_server.py tests/ui/test_http_server.py
• uv run ruff format --check src/coding_agent/ui/schemas.py src/coding_agent/ui/http_server.py tests/ui/test_http_server.py
• git diff --check

[coderabbitai]

📝 Walkthrough

Walkthrough

This PR adds a GitWorkspaceSourceRequest schema to the API contract, implements early rejection of Git workspace sources during provisioning with HTTP 501 status, improves error handling to preserve HTTP exception details, and adds test coverage validating the rejection behavior.

Changes

Git workspace source request schema and validation

Layer / File(s)	Summary
Git workspace source schema definition coding-agent/src/coding_agent/ui/schemas.py	Introduces GitWorkspaceSourceRequest Pydantic model with kind="git" literal, required Git-specific fields (remote_url, base_ref, base_sha), and optional runtime_profile. Updates WorkspaceSourceRequest union type to accept both Docker and Git sources.
Git workspace rejection and error handling coding-agent/src/coding_agent/ui/http_server.py	Adds explicit check in _provisioned_execution_binding_from_request to detect Git workspace sources and raise HTTP 501 "git workspace source is not implemented yet". Improves create_session error handling to re-raise HTTPException instances, preserving their original status codes and details instead of remapping them.
Git workspace rejection test coding-agent/tests/ui/test_http_server.py	Adds test test_create_session_rejects_git_workspace_source_until_supported that verifies session creation with Git workspace source fails with HTTP 501 and the expected error message when cloud workspace provisioning is configured.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Poem

A rabbit hops through Git-shaped dreams,
But workspace sources aren't what they seem,
With 501, "not yet!" it declares,
While schemas and tests show utmost care. 🐰

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'feat: add git workspace source contract' clearly and concisely describes the main change—adding a Git workspace source schema and related contract implementation.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/git-workspace-source-contract

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