Clank 0.20.0

• Enforce deterministic reactive-work and browser-module size budgets in CI, with timing diagnostics.
• Compare consecutive deployment activations using matched traffic windows, request latency, error rates, and activation duration, with explicit low-traffic and collection states.
• Add loopback-only DevTools for reactive dependency activity, computation lifetime, and opt-in backend query/cache diagnostics.
• Carry request trace context through backend operations, durable jobs, retries, and workflow steps; inspect bounded, metadata-only request/job timelines.
• Build validated synthetic fixture databases and seed isolated preview environments through the CLI and platform, preserving parent application data and recovery safety.
• Rehearse encrypted-backup recovery and database migrations on disposable copies, including application health checks, timing, table changes, and cleanup.
• Persist bounded agent tool activity with granted scopes, outcomes, timing, observed revisions, filters, and a local explorer.
• Queue browser mutations durably with account-bound transactional replay receipts, pending/retry states, expiry checks, and explicit conflict reconciliation.
• Add persistent user-owned notifications, read state, category preferences, accessible browser controls, and optional durable email delivery with stable provider idempotency keys.
• Ship approval-queue, customer-portal, and booking application recipes with authenticated UI/MCP contracts, ownership and transition rules, fixtures, migrations, and deployment configuration.
• Run generated-application contracts in independent Node test contexts and build composed applications before their tests, closing a verification gap in the CLI harness.