[codex] Add orchestration tool coverage tests

[senamakel]

Summary

• add focused unit coverage for graph orchestration tools through the public Tool::call path
• cover spawn task variants, await/cancel/kill/timeout/yield, race loser cancellation, validation failures, and steering payload/terminal-task behavior
• fix a parallel test temp-directory collision in git worktree tests by adding a monotonic suffix

Coverage

• all-features/all-targets line coverage: 92.25%
• src/graph/orchestration/tool.rs improved from 47.10% to 78.42%

Validation

• rustup run stable cargo fmt --check
• rustup run stable cargo clippy --all-features --all-targets -- -D warnings
• rustup run stable cargo test --all-features --all-targets
• rustup run stable cargo llvm-cov --all-features --all-targets --lcov --output-path lcov.info

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Review details

⚙️ Run configuration

Configuration used: Organization UI

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Run ID: fe1d05b5-5bad-41fb-8511-c99429a9357a

📥 Commits

Reviewing files that changed from the base of the PR and between 6bf67ac and 6fc1494.

📒 Files selected for processing (2)

• src/graph/orchestration/test.rs
• src/harness/workspace/git/test.rs

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