v0.2.1

One advisory, one entry, one severity

Each release note is analyzed independently, so the same advisory used to appear once per branch — sometimes with different severity grades (observed live: envoy CVE-2026-47692 rated high on v1.36.9 but critical on v1.37.5, listed twice in one briefing).

• check_stack briefings now fold on the advisory group (falling back to the per-note issue key when no advisory is attached).
• A folded entry shows the strongest judgment across its branches, and is mandatory if any branch says so.
• Summary counts follow the folded entries: an envoy v1.36.8 briefing drops from 38 to 20 distinct issues, and the critical count reads 3 — the real number of distinct critical advisories.

Stored facts are untouched; each still carries its verbatim quote and source URL.