Add integration test for GitHub get_commit schema normalization

[Copilot]

GitHub's MCP server returns get_commit with an invalid schema: {"type": "object"} without the required properties field. While schema normalization already handles this, there was no integration test validating the fix end-to-end.

Changes

• Add TestGitHubGetCommitSchemaPatch - Integration test that simulates GitHub backend returning broken get_commit schema and verifies automatic patching to {"type": "object", "properties": {}}

The test follows existing patterns: mock HTTP backend, validates tool registration, asserts schema normalization adds missing properties field.

// Simulates actual GitHub MCP server behavior
"inputSchema": map[string]interface{}{
    "type": "object",
    // Missing "properties" field - gets auto-patched
},

// Verification
assert.Contains(t, tool.InputSchema, "properties", "Schema must be patched")
assert.Empty(t, tool.InputSchema["properties"], "Properties should be empty map")

Original prompt

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This section details on the original issue you should resolve

<issue_title>get_commit</issue_title>
<issue_description>Add a test case to ensure that GitHub get_commit is properly patched. It returns an invalid schema.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes get_commit #320

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