feat: add Atlas PRD agent for product discovery

- src/prompts/atlas.ts — full Atlas system prompt (6-phase PM discovery flow)
- src/tools/prd.ts — finalize_prd tool that signals PRD completion
- src/agents/atlas.ts — Atlas agent config (Tier A, conversational)
- src/atlas.ts — atlasChat() multi-turn session handler
- server.ts — /atlas/chat, /atlas/sessions endpoints

Made-with: Cursor

dist/agents/index.js

@@ -6,11 +6,13 @@ require("../prompts/orchestrator");
 require("../prompts/coder");
 require("../prompts/pm");
 require("../prompts/marketing");
+require("../prompts/atlas");
 // Import agent files — side effects register each agent into the registry
 require("./orchestrator");
 require("./coder");
 require("./pm");
 require("./marketing");
+require("./atlas");
 // Re-export public API
 var registry_1 = require("./registry");
 Object.defineProperty(exports, "AGENTS", { enumerable: true, get: function () { return registry_1.AGENTS; } });