docs(spec): correct the llm() comment; config reads off globalThis.generator

pkg/spec/src/actions.ts

@@ -35,13 +35,13 @@ export function actions(generator: () => Action[]): GeneratorNode {
 }
 
 // llm selects the LLM action backend: instead of the seeded picker drawing a
-// random candidate, Go drives an OpenAI-compatible model that chooses which
+// random candidate, Go drives an OpenAI-compatible model that picks one
-// candidate to act on from the screenshot + the candidate list. The returned
+// candidate from the screenshot + the numbered candidate list. Assign it to the
-// marker is inert on the JS picker (pick.ts walks it to null); Go reads its
+// `generator` export; Go reads the config off globalThis.generator and the
-// config off globalThis.actions. API key comes from OPENROUTER_API_KEY
+// marker is inert on the JS picker (pick.ts walks it to null). API key comes
-// (OpenRouter) or OPENAI_API_KEY (OpenAI); OpenRouter wins when both are set.
+// from OPENROUTER_API_KEY (OpenRouter) or OPENAI_API_KEY (OpenAI); OpenRouter
-// Optional `instructions` are appended to the model's prompt as generic
+// wins when both are set. Optional `instructions` are appended to the model's
-// bug-hunting guidance for this spec; the model still only ranks candidates.
+// prompt to describe the app under test.
 export function llm(config: { model: string; instructions?: string }): GeneratorNode {
   return { kind: "llm", config };
 }