[FEAT repo-guard] - Add terminal condition for unrecoverable reconcile errors

[onuryilmaz]

User Story

As a platform operator, I want unrecoverable errors to stop the reconcile loop, so that archived repos and enterprise-managed teams don't burn GitHub API quota indefinitely.

Description

Archived repos and enterprise-managed teams cause infinite reconcile loops with no actionable signal for operators.

Acceptance Criteria

• Shared Terminal=True, reason=InvalidInput condition (with lastTransitionTime) added to all reconcilers
• Reconciler stops requeueing when terminal condition is set
• Requeue resumes only when spec changes
• Covers: archived repos, enterprise-managed teams

Reference Issues

N/A

[github-actions]

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