Task 6 report: deployment and durable run objects

Status

Implemented and committed as 112e9656 (feat: add Python deployment and run objects).

Added src/wf_client/deployments.py with immutable Deployment and DeploymentValidation snapshots plus strict artifact deployment selection.
Added src/wf_client/runs.py with immutable Run and bounded TracePage snapshots, resume/refresh lifecycle methods, and core interrupt/trace reconstruction.
Added tests/wf_client/test_deployments.py and tests/wf_client/test_runs.py.
Updated WorkflowArtifact, App, public exports, codecs, and structured deployment exceptions.

uv run pytest tests/wf_client/test_deployments.py tests/wf_client/test_runs.py tests/wf_api/test_deployment_api.py tests/wf_api/test_run_api.py -q — 30 passed.
uv run pytest tests/wf_client -q — 28 passed.
uv run ruff check src/wf_client tests/wf_client/test_deployments.py tests/wf_client/test_runs.py — passed.
uv run basedpyright --level error src/wf_client tests/wf_client/test_deployments.py tests/wf_client/test_runs.py — 0 errors.

.wf_mcp_store/ and test-artifacts/ remain untracked generated directories and were intentionally not staged.
Trace limits follow the existing server bound of 1–100 and are validated before issuing a trace request.