feat(heartbeat): add provider error-rate spike check

src/config/schema.test.ts

@@ -967,8 +967,11 @@ describe('configSchema automation', () => {
     const result = configSchema.parse(baseConfig);
     expect(result.automation.heartbeat.process_memory_threshold_mb).toBe(1500);
     expect(result.automation.heartbeat.backup_failure_threshold).toBe(1);
+    expect(result.automation.heartbeat.provider_error_rate_threshold).toBe(0.5);
+    expect(result.automation.heartbeat.provider_error_min_calls).toBe(5);
     expect(result.automation.heartbeat.checks).toContain('process_memory');
     expect(result.automation.heartbeat.checks).toContain('backup');
+    expect(result.automation.heartbeat.checks).toContain('provider_errors');
   });
 });
 

src/config/schema.ts

@@ -302,12 +302,12 @@ const gmailSchema = z.object({
   message: z.string().default('New email from {{from}}: {{subject}}\n\n{{snippet}}'),
 }).optional();
 
-const heartbeatCheckSchema = z.enum(['gateway', 'model', 'channels', 'memory', 'disk', 'process_memory', 'backup']);
+const heartbeatCheckSchema = z.enum(['gateway', 'model', 'channels', 'memory', 'disk', 'process_memory', 'backup', 'provider_errors']);
 
 const heartbeatSchema = z.object({
   enabled: z.boolean().default(false),
   interval: z.string().default('5m'),
-  checks: z.array(heartbeatCheckSchema).default(['gateway', 'model', 'channels', 'memory', 'disk', 'process_memory', 'backup']),
+  checks: z.array(heartbeatCheckSchema).default(['gateway', 'model', 'channels', 'memory', 'disk', 'process_memory', 'backup', 'provider_errors']),
   notify: z.object({
     channel: z.string().min(1),
     peer: z.string().min(1),
@@ -316,6 +316,8 @@ const heartbeatSchema = z.object({
   disk_threshold_mb: z.number().min(10).default(100),
   process_memory_threshold_mb: z.number().min(64).default(1500),
   backup_failure_threshold: z.number().min(1).max(10).default(1),
+  provider_error_rate_threshold: z.number().min(0).max(1).default(0.5),
+  provider_error_min_calls: z.number().min(1).default(5),
 }).default({});
 
 const gcalSchema = z.object({