Summary

• Fix DirectSub subscribe debounce race by eager topic init + tracking pending subscriptions for routing and subscriber discovery.
• Harden shared-log replication-info handling (serialize per-peer apply; buffer on NotStarted; dedupe subscription/request timers).
• Add pubsub regression tests for initializeTopic race and pending-subscribe window.

Tests

• pnpm --filter @peerbit/pubsub run build
• node ./node_modules/aegir/src/index.js run test --roots ./packages/transport/pubsub -- -t node --no-build
• node ./node_modules/aegir/src/index.js run test --roots ./packages/programs/data/shared-log -- -t node --no-build --grep "replicate:join not emitted on update"
• node ./node_modules/aegir/src/index.js run test --roots ./packages/programs/data/shared-log -- -t node --no-build --grep "migration-8-9"