fix(requesty): give a Requesty teammate override its own key

Teammates now inherit REQUESTY_API_KEY, and Requesty prefers it over
OPENAI_API_KEY. applyAgentProviderOverrideToEnv cleared and replaced the
dedicated keys of Merge, OrcaRouter, Runcrate and Command Code, but not
Requesty, so an agentModels Requesty override kept using the parent's
key. Clear it for every override and install the configured key for a
canonical Requesty endpoint.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/services/api/agentRouting.test.ts

@@ -892,3 +892,20 @@ test.each([undefined, 'parent-orca-key'])(
     expect(env.OPENAI_API_KEY).toBe('custom-key')
   },
 )
+
+test.each([undefined, 'parent-requesty-key'])(
+  'spawned Requesty override owns its key with ambient %s', ambient => {
+    const env: NodeJS.ProcessEnv = { REQUESTY_API_KEY: ambient }
+    applyAgentProviderOverrideToEnv({
+      model: 'openai/gpt-5-mini', baseURL: 'https://router.requesty.ai/v1',
+      apiKey: 'configured-agent-key',
+    }, env)
+    expect(env.REQUESTY_API_KEY).toBe('configured-agent-key')
+    expect(env.OPENAI_API_KEY).toBe('configured-agent-key')
+    applyAgentProviderOverrideToEnv({
+      model: 'custom', baseURL: 'https://custom.example/v1', apiKey: 'custom-key',
+    }, env)
+    expect(env.REQUESTY_API_KEY).toBeUndefined()
+    expect(env.OPENAI_API_KEY).toBe('custom-key')
+  },
+)

src/services/api/agentRouting.ts

@@ -57,6 +57,7 @@ const PROVIDER_ENV_VARS_TO_CLEAR_FOR_OVERRIDE = [
   'OPENAI_AUTH_SCHEME',
   'OPENAI_AUTH_HEADER_VALUE',
   'MERGE_GATEWAY_API_KEY',
+  'REQUESTY_API_KEY',
   'ORCAROUTER_API_KEY',
   'RUNCRATE_API_KEY',
   'CMD_API_KEY',
@@ -380,4 +381,8 @@ export function applyAgentProviderOverrideToEnv(
   if (resolveRouteIdFromBaseUrl(providerOverride.baseURL) === 'commandcode') {
     env.CMD_API_KEY = providerOverride.apiKey
   }
+  if (resolveRouteIdFromBaseUrl(providerOverride.baseURL) === 'requesty') {
+    const key = sanitizeApiKey(providerOverride.apiKey)
+    if (key) env.REQUESTY_API_KEY = key
+  }
 }