Report plugin removal failures

[martian56]

Fixes #176.

Summary:

• Return plugin removal errors when deletion commands fail and the plugin directory remains on disk.
• Include command stderr, stdout, exit codes, or launch errors in the failure detail when available.
• Verify successful removal by checking that the plugin directory is gone.
• Add a simulated removal-failure test for the remaining-directory path.

Checks:

• rvpm test
• rvpm build
• rvpm fmt --check

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 098172a4-86b1-4324-91eb-1eb01932922e

📥 Commits

Reviewing files that changed from the base of the PR and between e8aab6b and 6a2f449.

📒 Files selected for processing (4)

• CHANGELOG.md
• rv.toml
• src/plugins/manage.rv
• src/plugins/manage_test.rv

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix-plugin-removal-failures

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