Important: add_judge has no time bound

[0xdevcollins]

Severity: Important (fairness)

add_judge can be called during Judging phase or after finalize. Mid-judging additions create unfair scoring (some submissions evaluated by 3 judges, others by 4).

Fix

Require status == Registration || status == Submission. Apply same constraint to remove_judge.

Tests

• Add judge during Registration: ok
• Add judge during Submission: ok
• Add judge during Judging: rejected
• Add judge after Completed: rejected

[godamongstmen897]

Can you please assign me this issue to fix