Extends the .gitattributes eol=lf guard to assets/agents/** (33 embedded
shell scripts share the CRLF failure mode the hooks rules fix) and
scripts/*.sh. Adopts the probe-authored Scenario H: black-box checks of
the installed log-events.sh (XDG default, 0600, UTC header, secret
filter, symlink refusal) and notify.sh (control-byte-stripped fallback),
plus non-executable .builtin-manifest.