base-trixie: the image on Debian trixie, Postfix 3.10.13; Received: hidden on 465/587

The runtime base is debian:trixie-slim, the build stage golang:1.26-trixie:
Postfix 3.10.13 with upstream's 2026 security fixes up to the August
batch, libmilter 8.18.1, OpenSSL 3.5. Every citation of another program in
code, scripts and documents was re-read against the trixie sources
(dev/upstream; bookworm's kept in dev/upstream-bookworm) and updated;
development.md's cited-package table holds the trixie versions.

What the re-reading changed in behaviour:
- logtail: reject lines with sasl_method/sasl_username/sasl_sender
  (smtpd_check.c:1019-1026); cleanup's "removed (canceled)" forgets a
  port-25 id (cleanup_api.c:363-364).
- internal/postfix/retry.go reads postconf's stdout only: since 3.9 a
  deprecated-parameter warning on stderr made one value too many and the
  panel fell back to the compiled-in retry policy.
- logrotate-loop.sh: logrotate 3.22 exits 1 when it ignores a config;
  the loop refuses on that output whatever the status.
- postfix-config.sh: cyrus_sasl_config_path set explicitly (bookworm's
  07_sasl_config.diff is gone); maillog_file_permissions=0640; mynetworks
  explicit; Dockerfile: SYNC_CHROOT= in /etc/default/postfix,
  opendkim-tools dropped, openssl named, systemd-standalone-sysusers so
  cron does not bring the whole of systemd.
- The selfpost group is 10998, outside the system range 100-999: in
  trixie a package took 998 and the build failed (owner's decision:
  a conflict-free id, the distribution's own ids untouched). The
  entrypoint hands /data back by name when the user or the group differs.
  Guide, backup refusal text, help (design commit 68ec8b2), e2e.
- smtpd_hide_client_session=yes on smtps and submission (owner's
  decision): Received: names no client, TLS, login or protocol; port 25
  keeps the full header. e2e checks both.
- test/upstream/opendkim-probe.sh makes keys with openssl genrsa.

Tests: on the server, make e2e exit 0 (674 s, the image built on trixie),
go vet + go test 27 packages ok. CHANGELOG [Unreleased], guide,
architecture.md, security.md, roadmap.

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

internal/store/sendlog.go

@@ -100,7 +100,7 @@ func (s *Store) InsertRejected(e SendLogEntry) error {
 // wrote, and the milter's row holds it as Postfix logs it
 // (milter.recipientAsLogged); but a recipient repeated in another case is
 // one recipient to Postfix - cleanup drops the second, comparing folded
-// (Postfix 3.7.11, src/cleanup/cleanup_out_recipient.c, been_here() with
+// (Postfix 3.10.13, src/cleanup/cleanup_out_recipient.c, been_here() with
 // BH_FLAG_FOLD) - and one row to the milter, spelt as first given, and
 // log_adhoc() writes orig_to= only when it differs from to= other than in
 // case (src/global/log_adhoc.c, strcasecmp_utf8()). Assumptions D-S20. It
@@ -191,7 +191,7 @@ func (s *Store) CloseUnreported(id int64) (int64, error) {
 // ExpireMessage closes the rows of a message Postfix gave up on at the end of
 // its queue lifetime: each recipient's newest row with that queue id, if it
 // is still open ("queued" or "deferred"), becomes "bounced" - Postfix returns
-// the message to its sender. Postfix 3.7.11, src/qmgr/qmgr_active.c,
+// the message to its sender. Postfix 3.10.13, src/qmgr/qmgr_active.c,
 // qmgr_active_done_25_generic(), logs expiry once per message, "<id>:
 // from=<..>, status=expired, returned to sender", with no line per
 // recipient: the recipients' last lines say "deferred" (assumptions A-8). It