v0.26.18 - typed MCP repair tools

v0.26.18 is a patch release that closes MCP repair-surface gaps for
derived projects and hardens process-instance creation.

Added

• Added workitem-management.update_workitem for scoped WorkItem
  repairs, including process_definition_artifact.
• Added binding-management.update_binding for scoped Binding repairs,
  including contract-bearing conditions updates.
• Added gate-management.update_gate for guarded Gate definition
  repairs, with force=True reserved for explicit emergency updates
  after evaluation history exists.
• Added focused regression tests for WorkItem process instances,
  Binding repairs, Gate repairs, and eval-gate partial-write behavior.

Fixed

• Fixed create_process_instance so it persists
  process_definition_artifact immediately and no longer treats short
  titles or step titles as invalid slug summaries.
• Fixed get_workitem to include full spec plus process-instance and
  process-step fields in its response.
• Fixed codify_eval so Gate validation happens before writing the
  eval-spec Artifact, avoiding stranded partial creations.
• Added pk-doctor repair guidance for v2 contract findings that can now
  be fixed through MCP tools instead of hand-editing entity files.

Verification

• python3 -m py_compile context/skills/processkit/binding-management/mcp/server.py context/skills/processkit/gate-management/mcp/server.py context/skills/processkit/eval-gate-authoring/mcp/server.py context/skills/processkit/workitem-management/mcp/server.py context/skills/processkit/pk-doctor/scripts/checks/v2_contracts.py
• uv run --with mcp --with pyyaml --with jsonschema context/skills/processkit/binding-management/scripts/test_binding_management.py
• uv run --with mcp --with pyyaml --with jsonschema context/skills/processkit/gate-management/scripts/test_gate_management.py
• uv run --with mcp --with pyyaml --with jsonschema context/skills/processkit/eval-gate-authoring/scripts/test_eval_gate_authoring.py
• uv run --with mcp --with pyyaml --with jsonschema context/skills/processkit/workitem-management/scripts/test_workitem_management.py
• uv run context/skills/processkit/pk-doctor/scripts/test_doctor.py
• uv run context/skills/processkit/pk-doctor/scripts/doctor.py --category=v2_contracts --json
• uv run scripts/smoke-test-servers.py
• uv run context/skills/processkit/release-audit/scripts/release_audit.py --tree=both --repo-root .
• bash scripts/check-src-context-drift.sh --release-deliverable

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