Add debug logging and GitHub Actions log line offset

Add console.log statements to trace warning/error detection (total lines,
matched index, matched content, final result). Apply a +3 line offset to
firstIssueLine to account for GitHub Actions preamble lines in step logs.

https://claude.ai/code/session_01Eph17CQCfdnKaJhA2nSr9W

Author: claude

dist/index.js

@@ -74,17 +74,26 @@ for (const file of readdirRecursively(".")) {
   let compileResult = "✅success";
   let firstIssueLine = 1;
   const lines = compilationOutput.split("\n");
+  console.log(`total lines: ${lines.length}`);
   const warningIdx = lines.findIndex((line) => line.match(warningRegex));
+  console.log(`warningIdx: ${warningIdx}`);
   if (warningIdx !== -1) {
     compileResult = "⚠️warning";
     firstIssueLine = warningIdx + 1;
+    console.log(`matched warning line: ${lines[warningIdx]}`);
   } else {
     const errorIdx = lines.findIndex((line) => line.match(errorRegex));
+    console.log(`errorIdx: ${errorIdx}`);
     if (errorIdx !== -1) {
       compileResult = "❌error";
       firstIssueLine = errorIdx + 1;
+      console.log(`matched error line: ${lines[errorIdx]}`);
     }
   }
+  // GitHub Actions step logs have a few preamble lines before the actual output
+  const GITHUB_ACTIONS_LOG_OFFSET = 3;
+  firstIssueLine += GITHUB_ACTIONS_LOG_OFFSET;
+  console.log(`compileResult: ${compileResult}, firstIssueLine: ${firstIssueLine} (includes offset ${GITHUB_ACTIONS_LOG_OFFSET})`);
 
   const { data: job } = await octokit.rest.actions.getJobForWorkflowRun({
     owner,