feat: add ccache support in clean command

[mateuuszzzzz]

Summary

• Added ccache to the list of cleanup tasks
• Implemented isCCacheInstalled() to check if ccache is available using which ccache
• Changed createCleanupTasks() to async to support spawn-based availability checks

Test plan

When ccache is installed:

• Run npx rock clean
• Verify that [C/C++] CCache compiler cache appears in the cleanup options
• Select it and verify it runs ccache --clear successfully

When ccache is NOT installed:

• Run npx rock clean
• Verify that ccache option does NOT appear in the menu

You can easily test both scenarios using:

brew install ccache   # Test with ccache
brew uninstall ccache # Test without ccache

cc: @adhorodyski

---

Note

Adds a conditional ccache cleanup task and makes task creation async to detect availability.

• CLI: clean plugin
  • Add ccache cleanup task (ccache --clear), enabled only when available via isCCacheInstalled (which ccache).
  • Make createCleanupTasks async and update cleanProject to await it.
  • Extend CLEANUP_TASK_NAMES with ccache.
• Changeset
  • Patch bumps for rock and create-rock.

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[adhorodyski]

Only one change requested on the which command, other that that one NIT. Thanks for shipping this!

[thymikee]

@cursoragent add changeset with patch version bump, use PR title

[cursor]

Please finish setting up background agents. Go to Cursor

[thymikee]

@cursoragent try again

[adhorodyski]

@mateuuszzzzz can I ask you to please add a changeset for this? It's clear AI won't replace us just yet 😅