Audit and verify Engine testing coverage

All 33 tests pass. Let me verify the testing coverage against the
task c

**Testing Coverage Audit:**

- ✅ JSON roundtrip for Message, ToolCall, FunctionCall - ✅ Tool
schema validation (via encodeToolForApi test) - ✅ LLM config defaults
(defaultLLM tests) - ✅ Error handling for malformed responses
(tested in Usage/AgentResult

- ✅ Each tool has valid JSON schema (5 tests) - ✅ readFileTool
handles missing files - ✅ writeFileTool creates parent directories
(implicitly tested - return - ✅ editFileTool handles no-match case -
✅ runBashTool captures exit codes - ✅ searchCodebaseTool returns
structured results

- ✅ Engine and Tools integrate correctly (new test added) - Tool
execution works end-to-end (runBashTool, searchCodebaseTool tests -
Callbacks are testable (defaultEngineConfig test verifies callbacks fi

The task is complete. Created `Omni/Agent.hs` which provides:
1. Combined test runner for all Engine and Tools tests 2. Re-exports
core types from sub-modules 3. Integration tests verifying Engine
and Tools work together

All 33 tests pass with `bild --test Omni/Agent.hs`.

Task-Id: t-141.7

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