chore: add CI, .gitignore, and 35 new tests

[SuperInstance]

Summary

Adds CI, .gitignore, and expanded test coverage for the sandbox simulation framework.

Changes

• .gitignore: Python bytecode, build artifacts, IDE files, test caches
• GitHub Actions CI (ci.yml):
  • Test matrix: Python 3.10, 3.11, 3.12
  • Lint job: import structure check for all modules
• 35 new tests in tests/test_fleet_compat.py:
  • Fleet compat (16 tests): failure-to-status mapping for all 5 FailureTypes, error code mapping, simulation_result_to_status (success/error/partial/cancelled), to_fleet_error wrapping, FleetError passthrough, simulation_error, enrich_step_record (2 skipped — require real fleet-stdlib)
  • Harness edge cases (8 tests): reset, agent removal, string failure type injection, empty queue step, DELAYED/DUPLICATE/CORRUPTED failure modes, max_steps limit
  • FailureInjector advanced (6 tests): has_planned_failures, multiple same-step injections, targeted injection with agent filter, consume-once semantics, rate boundary behavior
  • Trust scores (3 tests): increase on success response, decrease on error response, clamp to [0.0, 1.0]
  • Agent send (2 tests): send via harness returns True, send without harness returns False

Test Results

• Before: 27 tests
• After: 62 tests (60 passed, 2 skipped)

Files Added

• .gitignore
• .github/workflows/ci.yml
• tests/test_fleet_compat.py

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[beta-devin-ai-integration]

Devin Review found 1 potential issue.

View 4 additional findings in Devin Review.

[beta-devin-ai-integration]

🟡 Wrong sys.path manipulation causes ImportError when running test file standalone

Line 17 adds src/ to sys.path (copied from test_extended.py), but lines 19-34 use from src.xxx imports (matching test_sandbox.py's style). These two patterns are incompatible: adding src/ to sys.path enables from harness.xxx imports (without the src. prefix), while from src.xxx imports require the project root on sys.path. Running python tests/test_fleet_compat.py fails immediately with ModuleNotFoundError: No module named 'src'. The file explicitly includes if __name__ == "__main__": unittest.main() at line 377 suggesting standalone execution is intended. Compare with tests/test_sandbox.py:14-17 which correctly adds the project root for the same from src.xxx import style.

Suggested change

	import os
	sys.path.insert(0, os.path.join(os.path.dirname(__file__), '..', 'src'))
	# Ensure project root is on sys.path so ``src.xxx`` relative imports resolve.
	_PROJECT_ROOT = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
	if _PROJECT_ROOT not in sys.path:
	sys.path.insert(0, _PROJECT_ROOT)

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