audit 5: findings of the two reviews

- The e2e's numeric-settings test ran a container that passed every gate
  and never ended: the good values are checked beside a bad one after
  them; each run is named, bounded to a minute and removed.
- The gates refuse a value under the parameter's minimum (a zero window
  kills anvil, a zero milter timeout smtpd) and one past an int, in
  seconds for a time value (src/global/conv_time.c, src/anvil/anvil.c).
- OpenDKIM waits, five seconds at most, for the relay's socket.
- The relay marks its lines `syslog: `, writes control characters out,
  reads into a queue at once and drops past 200 lines a second, saying
  how many (security F1, F2; a stuck relay would hold OpenDKIM in
  syslog(3)).
- smtp_tls_mandatory_protocols >=TLSv1.2 too.
- extract-cert.sh keeps the old files' group and sets its trap before
  mktemp.
- crashexit spares cert-reload; architecture.md "four times running" and
  what else exits the container; security.md the restart after five panel
  exits and the /dev/log socket.
- Measured against the technical review: smtpd has the selfpost group
  (Groups 104 998), so it did reach the supervisor socket before this
  stage.
Accepted, reasons in the plan: the logrotate state file in the postfix
user's directory, envdoc_test's reading of `${VAR:-}` only, crashexit's
window pruning untested.

Tested on the test server: go vet + go test of 27 packages, make e2e (all
pass, 592 s) on this tree.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

internal/logtail/logtail_test.go

@@ -18,7 +18,7 @@ import (
 // code cites (Postfix 3.7.11, src/global/log_adhoc.c and the others), unless a
 // comment says where one was seen; some carry no stamp, which the parsers
 // take as they come. One shape Postfix does not write here: opendkim lines in
-// mail.log (build/opendkim.conf has Syslog no).
+// mail.log (OpenDKIM logs through syslog(3), to the container log - build/opendkim.conf).
 
 // qmgr's expiry line, as Postfix 3.7.11 writes it (src/qmgr/qmgr_active.c,
 // qmgr_active_done_25_generic(): "%s: from=<%s>, status=%s, returned to