fix: remove /update command from merge-bot (not supported for fork PRs)

[vilsonrodrigues]

Summary

Removed the entire update-command job from the merge-bot workflow as it does not work for PRs from forks and never will due to GitHub security restrictions.

Problem

The /update command was designed to automatically merge the base branch into PR branches. However, it fails for all fork PRs because:

1. ❌ GitHub Actions cannot push to fork repositories (security restriction)
2. ❌ Even with PAT tokens, cross-repository writes are blocked
3. ❌ This is by design and cannot be worked around

Current Behavior (Before This PR)

When users try /update on fork PRs, they get:

ℹ️ Update commands are not supported for PRs from forks.

To update your branch, please run these commands locally:
...

This creates confusion and adds 369 lines of non-functional code.

Solution

Removed the entire update-command job (369 lines deleted).

Impact

✅ Benefits

• No more confusing "not supported" messages
• Cleaner codebase (removed non-functional code)
• Clear expectations: forks must update manually

ℹ️ For Contributors

To update your fork's PR branch:

git fetch upstream main
git merge upstream/main  
git push

Or use GitHub's "Update branch" button (available for some fork PRs).

⚠️ Limitation

The /update command only worked for same-repo branches anyway. Since most contributions come from forks, this feature was rarely usable.

Alternative Approaches Considered

1. Use PAT with elevated permissions - ❌ Violates security principles
2. Request users grant workflow permissions - ❌ Complex, error-prone
3. Keep code with better error message - ❌ Maintaining 369 lines for an error message doesn't make sense

Files Changed

• .github/workflows/merge-bot.yml - Removed update-command job (369 lines deleted)

Testing

• Workflow file is valid YAML
• Remaining /merge command still works
• No references to removed job in other workflows

🤖 Generated with Claude Code

[vilsonrodrigues]

/merge