Fix the three tests that fail on main

[Doringber]

What

The CI job on main was already red before the readiness work. These are the three failures.

• tests/test_version.py compared the resolver to the hardcoded string 0.1.1 after VERSION moved to 0.1.2. Both tests now read VERSION and assert the resolver matches that file, so the next bump does not break them.
• test_cursor_agent_client_normalizes_malformed_tool_payloads expects a non-object mcpToolCall to fail the run. _tool_payload treated a list as an empty object and reported success. mcpToolCall and getMcpToolsToolCall now raise ValueError when the value is not an object, which the client reports as Malformed Cursor agent response.

Tests

• Added a parametrized parser test for both payload keys.
• CI selection: 266 passed, 22 deselected, coverage 87.87% (threshold 85%). The three previous failures are gone.