Move Composio, logo.dev and Antigravity keys into Settings

The three third-party keys were hardcoded or read from the environment.
Operators now enter them in Settings > Integrations; they are stored
encrypted in the app-wide integration_keys table (migration 058).
An agent holding connector grants fails loudly when no Composio key is
saved. The goal-review test no longer depends on absolute dates.

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

tests/unit/agent-instructions.test.ts

@@ -125,6 +125,7 @@ describe("agent instruction wiring", () => {
       });
       const providerId = (connection.db.prepare("select id from providers where org_id = ? and provider_key = 'openai'").get(orgId) as { id: string }).id;
       providers.saveCredential({ orgId, providerId, secret: "sk-test", model: "gpt-5.4" });
+      providers.integrationKeys.write("composio", "ak_test");
       agentId = organization.createAgent({
         orgId, name: "Ada", role: "Engineer", department: "Engineering",
         modelProviderId: providerId, modelId: "gpt-5.4", budgetCents: 1000, managerAgentId: null,