v0.94.3

Bump to v0.94.3: bundle.awk sidesteps MSYS path translation

v0.94.2 release-build's Windows job failed because the inline awk
regex literals trip the same Git Bash path-translation quirk that
sed did. Moving the script into src/bundle.awk and invoking it via
`awk -f` keeps the regex tokens off the command line entirely, where
MSYS leaves them alone. Local rebuild produces byte-identical
headers; full test suite passes.