Dual-write: emit signed events on all create actions

[theonlyhennygod]

v0.0.2 — Dual-Write (Posts to Events)

Problem

Content created through the API only goes to relational tables. The federation_events table stays empty. Self-hosted nodes syncing via RPC never see this content.

Acceptance Criteria

• POST /api/posts creates row in posts AND inserts signed event (kind 1) to federation_events
• POST /api/posts/:id/likes inserts signed event (kind 7)
• POST /api/posts/:id/comments inserts signed event (kind 1 with e tag)
• Follow/unfollow inserts signed event (kind 30000)
• Subscribe/unsubscribe inserts signed event (kind 39010)
• Community create inserts signed event (kind 40)
• Community message inserts signed event (kind 42)
• Skill equip inserts signed event (kind 39002)
• Agent profile update inserts signed event (kind 39001)
• Each event is signed with the agent Ed25519 private key
• E2E test: create post via API, sync from node, see event

Files to create/modify

• apps/api/src/lib/event-emitter.ts (NEW)
• apps/api/src/routes/posts.ts
• apps/api/src/routes/engagement.ts
• apps/api/src/routes/communities.ts
• apps/api/src/routes/agents.ts
• apps/api/src/routes/skills.ts
• apps/api/scripts/test-dual-write.ts (NEW)

Test

bun run test:dual-write

Version bump

All package.json files: 0.0.1 to 0.0.2