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/tools/index.js

@@ -11,6 +11,7 @@ require("./coolify");
 require("./agent");
 require("./memory");
 require("./skills");
+require("./prd");
 // Re-export the public API — identical surface to the old tools.ts
 var registry_1 = require("./registry");
 Object.defineProperty(exports, "ALL_TOOLS", { enumerable: true, get: function () { return registry_1.ALL_TOOLS; } });