fix: normalize paths to forward slashes for Windows RegExp compatibility

Windows path.relative() produces backslashes (e.g., memory\2026-02-16.md)
which fail to match RegExp patterns using forward slashes.

Normalize relative paths to forward slashes before RegExp matching
using rel.split(path.sep).join('/').

Fixes 4 test failures on Windows CI.

src/auto-reply/reply/post-compaction-audit.ts

@@ -30,7 +30,9 @@ export function auditPostCompactionReads(
       // RegExp — match against relative paths from workspace
       const found = readFilePaths.some((p) => {
         const rel = path.relative(workspaceDir, path.resolve(workspaceDir, p));
-        return required.test(rel);
+        // Normalize to forward slashes for cross-platform RegExp matching
+        const normalizedRel = rel.split(path.sep).join("/");
+        return required.test(normalizedRel);
       });
       if (!found) {
         missingPatterns.push(required.source);