Complete core event system setup

[jordanpartridge]

Context

Migrated from jordanpartridge/vision#2. Event intake system for Synapse Sentinel Phase 2.

Completed

• Create synapse-sentinel/core repo
• Initialize Laravel app with Laravel Verbs
• Create webhook route for gate results (using Spatie webhook client)
• Add gate workflow for self-certification (100% coverage)
• CertificationCompleted event

Remaining Tasks

• Create additional Event models (CertificationRequested, CertificationFailed, etc.)
• Document event schema

Event Schema (Draft)

CertificationCompleted

{
  "repository": "string (required)",
  "sha": "string (required)", 
  "verdict": "approved|rejected|escalate (required)",
  "reason": "string (optional)",
  "checks": "object (optional)",
  "triggered_by": "string (optional)",
  "pr_number": "integer (optional)"
}

Architecture

Gate Workflow → POST /webhooks/gate → Core
                                        ↓ stores events
                                   Laravel Verbs

[jordanpartridge]

Completed in PR #6 - event system shipped with full coverage.