142b991334
1. config.go: AI_CS_ENV runtime mode with production restriction - New RuntimeConfig.Env field (AI_CS_ENV / AI_CS_RUNTIME_ENV) - production + Postgres.Enabled=false → Load() returns error - production + empty webhook secret → Load() returns error - normalizeRuntimeEnv: dev/dev/ → development, prod/production → production, test → test 2. app.go: probe.SetReady only when store is confirmed ready - Postgres.Enabled: probe.SetReady(true) after DB+migration OK - Memory mode: probe.SetReady(false) — not production-ready 3. health_handler_test.go: add probe live+ready state transition tests 4. config_test.go: add TestLoad_RejectsProdWhenPostgresDisabled, TestLoad_RejectsProdWhenWebhookSecretMissing 5. app_test.go: add TestNew_RejectsMemoryModeWithoutExplicitNonProdEnv, TestNew_AllowsMemoryModeInTestEnv, TestNew_WithPostgresEnabled_* for invalid DSN and migration-failure paths Phase 1 (code gate) objectives met: ✅ prod cannot fall back to memory store ✅ readiness reflects actual store readiness ✅ both changes have test coverage