feat: Add Webhook Reliability Architect kit

[amarkumar00]

Summary

• adds the Webhook Reliability Architect AgentKit with a focused workflow for designing duplicate-safe webhook delivery
• includes the Studio-exported Lamatic TypeScript flow, externalized prompts, constitution, and Gemini model configuration
• ships a polished Next.js app that produces an idempotency contract, bounded retry policy, dead-letter replay plan, observability controls, failure analysis, and rollout evidence
• supports both the deployed Lamatic flow and a deterministic local demo mode

Why

Webhook redelivery, lost acknowledgements, concurrent duplicates, and poison payloads can repeat real business side effects. This kit turns a sanitized delivery scenario into a concrete, reviewable reliability blueprint instead of generic retry advice.

Validation

• npm run typecheck
• npm run build
• npm audit --audit-level=high — 0 vulnerabilities
• all seven AgentKit @reference paths resolve
• secret-pattern scan passes and no .env.local file is committed
• Generate JSON node test, full Lamatic flow test, deployment, and live Next.js-to-Lamatic execution succeeded

Scope

All changes are contained in kits/webhook-reliability-architect/.

[github-actions]

:robot_face: AgentKit Structural Validation

New Contributions Detected

• Kit: kits/webhook-reliability-architect

Check Results

Check	Status
No edits to existing kits	✅ Pass
Required root files present	✅ Pass
Flow .ts files present	✅ Pass
lamatic.config.ts valid	✅ Pass
No changes outside kits/	✅ Pass

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🎉 All checks passed! This contribution follows the AgentKit structure.

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