chore: Simplify native CLI installer command construction

[hatayama]

Summary

• Preserve native CLI installer behavior while separating command construction from process and path responsibilities.
• Keep the existing public installer command API unchanged.

User Impact

• No user-visible behavior change.
• Setup and uninstall continue to produce the same executable names, arguments, manual commands, release tags, and installer script URLs.

Changes

• Move install command construction and quoting helpers into NativeCliCommandBuilder.
• Keep NativeCliInstaller.GetInstallCommand as the public facade.
• Keep uninstall path resolution in NativeCliInstaller until the path responsibility is split separately.
• Retarget command-focused tests and the overload guard to the extracted builder; the guard still reports missing targets.

Verification

• Unity compile: 0 errors, 0 warnings
• NativeCliInstallerTests: 32 passed
• StaticFacadeStateGuardTests: 20 passed
• CliSetupApplicationServiceTests: 4 passed
• git diff --check
• No IPC or protocol changes

[coderabbitai]

📝 Walkthrough

Walkthrough

This PR extracts install-command and installer-script URL construction logic from NativeCliInstaller into a new NativeCliCommandBuilder class. NativeCliInstaller now delegates to the new builder for command construction, quoting, and URL generation, with corresponding tests and an overload-guard allowlist updated to reference the new file.

Changes

Command Builder Extraction

Layer / File(s)	Summary
New command builder core Packages/src/Editor/Infrastructure/CLI/NativeCliCommandBuilder.cs	New internal static class builds remote/local install commands for POSIX and Windows platforms, branching on RuntimePlatform.
Path resolution and quoting/URL helpers Packages/src/Editor/Infrastructure/CLI/NativeCliCommandBuilder.cs	Adds local installer script path resolution, POSIX/PowerShell/process argument quoting utilities, release tag normalization, and installer script URL construction.
NativeCliInstaller delegation Packages/src/Editor/Infrastructure/CLI/NativeCliInstaller.cs	GetInstallCommand and BuildUninstallCommand now delegate to NativeCliCommandBuilder; ~174 lines of duplicated private helper methods are removed.
Test and guard updates Assets/Tests/Editor/NativeCliInstallerTests.cs, Assets/Tests/Editor/StaticFacadeStateGuardTests.cs	Tests switch command/URL construction calls to NativeCliCommandBuilder; the overload guard allowlist path is updated to target the new file.

Estimated code review effort: 3 (Moderate) | ~25 minutes

Possibly related PRs

• hatayama/unity-cli-loop#1032: Both modify NativeCliInstaller's install-command construction path, one refactoring it into NativeCliCommandBuilder, the other adding legacy-removal logic to it.
• hatayama/unity-cli-loop#1169: Both touch BuildUninstallCommand/uninstall behavior in NativeCliInstaller, one moving quoting into NativeCliCommandBuilder.
• hatayama/unity-cli-loop#1190: Both change installer-script URL construction for stable vs beta release tags in the same code path.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly matches the refactor to simplify native CLI installer command construction.
Description check	✅ Passed	The description is directly related to the changeset and accurately summarizes the refactor and verification.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch refactor/hatayama/split-native-cli-installer

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[cubic-dev-ai]

No issues found across 5 files

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[coderabbitai]

✅ Action performed

Review finished.

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