docs: Explain V2 and V3 project coexistence

[hatayama]

Summary

• explain automatic delegation from the native v3 dispatcher to matching v2 CLIs
• document the Node.js 22+ and initial npm cache requirements
• clarify dispatcher-owned commands and warn against v2 Setup UI update or downgrade actions
• replace global v2 switching instructions in both English and Japanese documentation

Validation

• git diff --check
• confirmed the removed global v2 installation command no longer appears in either README
• compared the documented detection, cache, routing, stderr, and version behavior with the merged dispatcher implementation

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 0b563ad2-021d-404d-a285-b33a62dd8deb

📥 Commits

Reviewing files that changed from the base of the PR and between e0bc7f7 and d2cc542.

📒 Files selected for processing (2)

• README.md
• README_ja.md

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📝 Walkthrough

Walkthrough

The README files now document v3 dispatcher retention, automatic v2 delegation requirements, stderr behavior, and revised recovery steps for terminals resolving to a legacy npm CLI.

Changes

CLI dispatcher documentation

Layer / File(s)	Summary
Dispatcher behavior and v2 delegation README.md, README_ja.md	Documents v3 dispatcher retention, automatic v2 delegation, Node.js 22+ requirements, stdout/stderr behavior, and restrictions on changing CLI versions through project Settings.
Native installer recovery instructions README.md, README_ja.md	Replaces global v2 CLI installation steps with removal of the legacy npm package followed by verified native dispatcher installation, including PowerShell guidance.

Estimated code review effort: 1 (Trivial) | ~5 minutes

Possibly related PRs

• hatayama/unity-cli-loop#1034: Related installer changes for copying the dispatcher and removing legacy global npm launchers.
• hatayama/unity-cli-loop#1076: Related README guidance for switching between v3 and v2 CLI installations.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the documentation update about V2 and V3 project coexistence.
Description check	✅ Passed	The description matches the README changes and validation steps described in the pull request.
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.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/v2-v3-coexistence

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