fix: require skills directories for auto-install detection

[hatayama]

Summary

• require an existing skills directory before treating .claude, .agents, .cursor, or .agent as auto-install targets
• keep the installed-state check based on actual uLoop skill directories instead of parent folder presence alone
• add editor tests for the parent-only case and the empty skills-directory case, and update the setup UI copy to match the new rule

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Summary by cubic

Require an existing skills directory for auto-install detection of .claude, .agents, .cursor, and .agent to prevent false positives and unwanted folder creation. The setup wizard still detects tool roots without skills so first-time installs remain available.

• Bug Fixes
  • Auto-install: detect targets only when <tool>/skills exists; skip parent-only roots.
  • Setup: keep root-directory detection and messaging; offer first-time installs when only the parent exists.
  • Determine installed state via SKILL.md inside uLoop skill folders.
  • Editor tests use temporary project roots; cover parent-only and empty skills cases.

^{Written for commit ba16bee. Summary will update on new commits.}

[cubic-dev-ai]

No issues found across 3 files

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 4d3b038a-c3c1-486a-b94c-3eff76e12a64

📥 Commits

Reviewing files that changed from the base of the PR and between ffa3863 and ba16bee.

📒 Files selected for processing (2)

• Assets/Tests/Editor/ToolSkillSynchronizerTests.cs
• Packages/src/Editor/Config/ToolSkillSynchronizer.cs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature/hatayama/fix-skill-auto-install-detection

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