test(api): cover task patch validation

[Vann-Dev]

Summary

• extract Agent API task patch validation into a focused helper for server/API-level coverage
• add node:test regression cases for valid done-summary/readBy parsing and stable invalid mutation errors
• keep route behavior unchanged while making note/summary/read-marker validation auditable

Checks

• DATABASE_URL=postgresql://postgres:postgres@localhost:5432/agentbridge?schema=public corepack pnpm test:task-freshness
• corepack pnpm lint
• DATABASE_URL=postgresql://postgres:postgres@localhost:5432/agentbridge?schema=public corepack pnpm typecheck:web
• DATABASE_URL=postgresql://postgres:postgres@localhost:5432/agentbridge?schema=public AUTH_SECRET=local-placeholder-auth-secret NEXT_TELEMETRY_DISABLED=1 corepack pnpm build

[vercel]

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Project	Deployment	Actions	Updated (UTC)
agent-bridge-web	Ready	Preview, Comment	May 15, 2026 6:48am