bug: verification badge never expires — the documented 12/6-month window is never checked

[yakew7]

Problem

data/CONTRIBUTING.md explicitly documents an expiry window for the verified block:

A verification stays valid for 12 months — or 6 months for exam centres (sat_centre / foreign_lang_exam_centre)... After the window, the place should be verified again or the block removed.

data/competitions/CONTRIBUTING.md documents the same idea for competitions (6 months).

But nothing in the codebase actually enforces or checks this window:

• src/components/pins/verified-badge.tsx:

  export function VerifiedBadge({ place }: { place: Place }) {
    if (!place.verified) return null;
    return ( /* renders the badge unconditionally */ );
  }

  There is no comparison of place.verified.on against "now" — a verification from years ago renders the exact same green "Verified" badge as one from yesterday, forever.

• scripts/check-data-freshness.mjs (the script that already flags expired valid_till dates and lapsed competition cycles) never reads the verified block at all:

  $ grep -n "12.*month\|6.*month\|expir\|stale" src/lib src/components scripts -r --include="*.ts" --include="*.tsx" --include="*.mjs"
  # (no hits outside comments/docs — nothing checks verified.on against an expiry window)
  

So the documented behavior ("badge disappears after 12/6 months") doesn't exist — it's aspirational text with no code backing it.

Fix

Pick one (or both):

1. VerifiedBadge (and the equivalent competition card badge) should stop rendering once verified.on is older than the documented window (6 months for sat_centre/foreign_lang_exam_centre and competitions, 12 months for everything else).
2. scripts/check-data-freshness.mjs should flag (warn or error) any record whose verified.on has passed its window, the same way it already flags an expired valid_till.

Acceptance criteria

• The 12/6-month window from data/CONTRIBUTING.md / data/competitions/CONTRIBUTING.md is actually enforced somewhere in code
• A unit test covers a verified block that's past its window