Feature request: option to disable "Pull request status couldn't be checked" notification for no-PR workflows

Summary

When using a direct-commit-to-main workflow (no pull requests), the status bar in FleetView repeatedly shows a "Pull request status couldn't be checked" notification — approximately once per minute. This is disruptive for solo developers who intentionally don't use PRs.

Steps to reproduce

1. Have a local git repo with a GitHub remote (origin)
2. Work directly on main branch without any open PRs (solo developer workflow)
3. Observe the status bar — it periodically flashes "Pull request status couldn't be checked"

Expected behavior

Either:

• No notification when there are simply no open PRs (as opposed to an actual error)
• A config option to opt out of PR status checking (e.g., in settings.json or .claude/settings.json)

Actual behavior

The notification appears repeatedly (~once/minute) even though this is an intentional workflow choice, not an error state.

Context

• Single developer project, direct commits to main, no PR workflow
• GitHub remote is configured and gh auth is valid — this is not an authentication failure
• Tried setting "github@claude-plugins-official": false in enabledPlugins in settings.json — did not suppress the notification
• The notification appears to come from FleetView's built-in PR status polling, not the GitHub plugin

Proposed fix

Add a settings.json option such as:

{
  "prStatusCheck": false
}

Or suppress the notification when the absence of PRs is a normal state (not a connection/auth error).

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This is a feature request / UX improvement for solo developers who don't use PR workflows.