Add plan-background-jwt-pool-and-expiry.md (Phase A/B, expiryDays + buffer sizing,
pool size 100). Add plugin-feedback-daily-notification-configureNativeFetcher-jwt-pool.md
for daily-notification-plugin: optional jwtTokens on configureNativeFetcher. Link plan
to plugin doc and endorser-jwt-background-prefetch-options.md.
