[Spelunker] Fix dramatic typo in selection prompt (#651)

Also a few minor prompt tweaks.

ts/packages/agents/spelunker/src/makeSelectorSchema.ts

@@ -4,8 +4,8 @@
 // Identifier for a chunk of code.
 export type ChunkId = string;
 
-// A chunk is a function/method, class or module.
-// Nested chunks are elided from the chunk text (they are their own chunk).
+// A chunk is a function/method, class, module/file, interface, type, etc.
+// Nested chunks have been elided from the chunk text (they are their own chunk).
 export type ChunkDescription = {
     chunkId: ChunkId;
     relevance: number; // Float between 0.0 and 1.0

ts/packages/agents/spelunker/src/searchCode.ts

@@ -326,11 +326,11 @@ async function selectRelevantChunks(
     const prompt = `\
     Please select up to 30 chunks that are relevant to the user question.
     Consider carefully how relevant each chunk is to the user question.
-    Provide a relevance scsore between 0 and 1 (float).
+    Provide a relevance score between 0 and 1 (float).
     Report only the chunk ID and relevance for each selected chunk.
-    Omit irrelevant chunks. It's fine to select fewer than 30.
+    Omit irrelevant or empty chunks. It's fine to select fewer than 30.
 
-    User question: "{input}"
+    User question: "${input}"
 
     Chunks:
     ${prepareChunks(chunks)}