feat: oh-my-opencode-slim support

[Poorgramer-Zack]

PR Changes:

• Oh My Opencode Slim support: You can now use the omo-switch with a slim fork!
• Backup Clean up: Add backup cleanup logic so that omo-switch will now delete backup files older than 30 days.
• Add omos alias: You can use omos instead of omo-switch for quicker commands!
• Remove --activate in add command: The --activate option had a bug and wasn’t working, so I removed it to keep every command simple.
• Update default template: Update the default template for the omo config to match the latest version.

[Poorgramer-Zack]

/oc Check if there’s anything I missed.

[opencode-agent]

Based on my review, here are the items that appear to be missed in this PR:

Critical

1. Version bump needed - package.json still shows 0.1.1, but this is a major feature release (OMOS support, new type command, backup cleanup). Should be bumped to 0.2.0 or 1.0.0.

2. No CHANGELOG - A CHANGELOG.md file documenting this release would be valuable for users.

Documentation

3. Backup cleanup not documented - The 30-day backup retention feature (src/utils/backup-cleaner.ts:4) is not mentioned in README. Should be documented in the Features section or under Troubleshooting > Finding Backups.

4. Breaking change undocumented - The --activate option was removed from add command. This should be documented:

   • In a CHANGELOG
   • Or as a migration note in README
   • Users relying on this option will be affected

5. No migration guide - No notes for existing users about:

   • Breaking change (--activate removal)
   • New OMOS support and how to migrate to it

Minor / Potential Improvements

6. Configurable backup retention - The 30-day period is hardcoded. Could be made configurable via settings.

7. Backup cleanup notification - When cleanOldBackups() runs, users aren't notified of deletions (see src/store/index.ts:125, src/store/project-store.ts:155, src/store/omos-config.ts:182).

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Positive notes: All new features have tests, build is clean, PR workflow is set up correctly, and the omos alias is documented in README.

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