Two bugs in ExtractMeta:
1. scanner.Err() was checked inside the Scan() loop. According to the
bufio.Scanner docs, Err() returns nil during a successful scan; it
only reflects an error after Scan() returns false. Moving the check
after the loop ensures real I/O errors are surfaced instead of
silently ignored.
2. The len(matches) guard was 'len(matches) > 1' but the code
accessed matches[2] (requires len >= 3). reHeaderPatternV2 always
produces a 3-element slice when it matches, but the condition was
misleading and could panic if the regex were ever changed to make
the second capture group optional. Changed to 'len(matches) > 2'.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
