Summary

• Add copy_to_output option to workspace-file check command
• When copy_to_output = true, the checked file is copied to the log output directory for human review
• Passes log_output_dir through AssertionChecker to assertion functions

Example

[[checks]]
name = "Check output file exists"
command = { command = "workspace-file", path = "output/results.txt", copy_to_output = true }

Test plan

• cargo test passes (27 tests)
• cargo clippy clean
• Updated all call sites including unit tests

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