feat: add support for Claude LLM integration across multiple modules

- Introduced `useClaude` option in `AnalysisPipelineOptions` to toggle Claude LLM usage.
- Updated `processProductChunk` and `analyzeProducts` functions to accept and handle `useClaude` parameter.
- Modified argument parsing in various scripts (`bestsellers-by-category`, `mid-range-sellers-by-category`, `top-monthly-sold-by-category`, etc.) to include `--claude` flag.
- Enhanced `analyzeProductsInternal` to differentiate between LLM providers and handle requests to Claude API.
- Added error handling for Claude API responses and ensured proper configuration for using Claude.
- Updated documentation and usage messages to reflect the new `--claude` flag.

src/bestsellers-by-category.ts

@@ -26,6 +26,7 @@ type ParsedArgs = {
   categoryLimit: number;
   perCategoryTop: number;
   blacklistFile: string;
+  useClaude: boolean;
 };
 
 type CategoryRunSummary = {
@@ -72,6 +73,7 @@ function log(
 
 function parseArgs(): ParsedArgs {
   const args = process.argv.slice(2);
+  const useClaude = hasFlag(args, "--claude");
   const outputDir =
     readFlagValue(args, "--out-dir") ?? path.join(process.cwd(), "output");
   const blacklistFile =
@@ -100,9 +102,14 @@ function parseArgs(): ParsedArgs {
     categoryLimit,
     perCategoryTop,
     blacklistFile,
+    useClaude,
   };
 }
 
+function hasFlag(args: string[], flag: string): boolean {
+  return args.includes(flag);
+}
+
 function readFlagValue(args: string[], flag: string): string | undefined {
   const idx = args.indexOf(flag);
   if (idx === -1) return undefined;
@@ -118,7 +125,7 @@ function printUsageAndExit(message: string): never {
     "error",
     [
       "Usage:",
-      "  bun run src/bestsellers-by-category.ts [--category-limit 32] [--per-category-top 100] [--out-dir output] [--blacklist-file category-blacklist.csv]",
+      "  bun run src/bestsellers-by-category.ts [--category-limit 32] [--per-category-top 100] [--out-dir output] [--blacklist-file category-blacklist.csv] [--claude]",
       "",
       "Flow:",
       "  1) Discover categories and round-robin selection.",
@@ -1011,6 +1018,7 @@ export async function processCategory(
   runId: number,
   category: CategoryInfo,
   perCategoryTop: number,
+  useClaude = false,
 ): Promise<CategoryRunSummary> {
   log("info", `\nCategory ${category.label} (${category.id})`);
 
@@ -1106,7 +1114,7 @@ export async function processCategory(
 
     let batchVerdicts: LlmVerdict[];
     try {
-      batchVerdicts = await analyzeProducts(batch);
+      batchVerdicts = await analyzeProducts(batch, { useClaude });
     } catch (err) {
       const message = err instanceof Error ? err.message : String(err);
       log("warn", `  LLM batch failed: ${message}`);
@@ -1192,7 +1200,7 @@ export async function main(): Promise<void> {
 
   mkdirSync(args.outputDir, { recursive: true });
   const DB_PATH =
-    process.env.RESULTS_DB_PATH || path.join(process.cwd(), "db", "results.db");
+    process.env.RESULTS_DB_PATH || path.join(process.cwd(), "db", "results.db");
   initDb(DB_PATH);
   const db = getDb(DB_PATH);
 
@@ -1249,6 +1257,7 @@ export async function main(): Promise<void> {
         runId,
         category,
         args.perCategoryTop,
+        args.useClaude,
       );
 
       totalInsertedAsins += categorySummary.results?.length ?? 0;