Fetches open community PRs, classifies them (security/fix/test/docs/feature),
assesses risk (core file changes, size, missing tests), detects file conflicts
between PRs, and suggests merge order (security first, features last).
Outputs structured JSON to stdout for /autoplan consumption.
Usage:
gstack-pr-triage # all open community PRs
gstack-pr-triage 154 155 156 # specific PRs
gstack-pr-triage --category fix # filter by type