fix sticky comment variable name (#226)

* fix sticky comment variable name

* fix condition

src/github/context.ts

@@ -63,7 +63,7 @@ export function parseGitHubContext(): ParsedGitHubContext {
       directPrompt: process.env.DIRECT_PROMPT ?? "",
       baseBranch: process.env.BASE_BRANCH,
       branchPrefix: process.env.BRANCH_PREFIX ?? "claude/",
-      useStickyComment: process.env.STICKY_COMMENT === "true",
+      useStickyComment: process.env.USE_STICKY_COMMENT === "true",
     },
   };