feat: Run compatible legacy projects from one launcher

[hatayama]

Refs: V3 dispatcher to V2 CLI delegation — To-Do 5–8

Summary

• Runs compatible legacy projects through the installed launcher without global CLI switching.
• Stores each required legacy CLI version separately and forwards command arguments unchanged.

User Impact

• Projects from both CLI generations can share one launcher.
• Missing Node or installation failures retain actionable guidance.

Changes

• Install the matching legacy package into a versioned cache through npm.
• Resolve the package bin entrypoint and invoke it through Node.
• Keep global management commands and launch handling in the dispatcher.

Verification

• scripts/check-go-cli.sh (pass)

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Review details

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 90170a54-7b41-42fc-a350-3ed58732b8c4

📥 Commits

Reviewing files that changed from the base of the PR and between c6f0af7 and 83fa3e0.

📒 Files selected for processing (7)

• cli/dispatcher/internal/dispatcher/dispatcher_v2_delegate.go
• cli/dispatcher/internal/dispatcher/dispatcher_v2_delegate_test.go
• cli/dispatcher/internal/dispatcher/dispatcher_v2_detect_test.go
• cli/dispatcher/internal/dispatcher/dispatcher_v2_install.go
• cli/dispatcher/internal/dispatcher/dispatcher_v2_install_test.go
• cli/dispatcher/internal/dispatcher/dispatcher_v2_run.go
• cli/dispatcher/internal/dispatcher/run_dispatcher.go

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/v2-cli-delegation

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