fix: Busy responses no longer create Unity Console errors

[hatayama]

Summary

• Expected busy responses now return through the command result without adding Unity Console errors.
• Existing JSON-RPC server_busy payloads remain unchanged so CLI clients can keep treating them as retryable.

User Impact

• When another command arrives while Unity is already running a command, users still receive the busy response.
• The Unity Console no longer shows an error for this expected single-flight rejection, so real Editor errors are easier to notice.

Changes

• Skip Unity Console error logging for UnityCliLoopToolBusyException in the JSON-RPC request path.
• Update busy-response coverage to assert the server_busy payload and no unexpected Console log output.

Verification

• Packages/src/Cli~/dist/darwin-arm64/uloop compile --project-path /Users/a12115/ghq/hatayama/unity-cli-loop
• Packages/src/Cli~/dist/darwin-arm64/uloop run-tests --test-mode EditMode --filter-type regex --filter-value JsonRpcProcessorCliVersionGateTests --project-path /Users/a12115/ghq/hatayama/unity-cli-loop
• Packages/src/Cli~/dist/darwin-arm64/uloop get-logs --log-type Error --max-count 10 --project-path /Users/a12115/ghq/hatayama/unity-cli-loop
• ~/.codex/skills/codex-review/scripts/codex-review v3-beta

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 46f4b109-390e-496b-aa07-27ee64c82842

📥 Commits

Reviewing files that changed from the base of the PR and between 6db2446 and 214d589.

📒 Files selected for processing (2)

• Assets/Tests/Editor/JsonRpcProcessorCliVersionGateTests.cs
• Packages/src/Editor/Infrastructure/Api/JsonRpcProcessor.cs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature/hatayama/remove-busy-console-log

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No issues found across 2 files

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