audit 2c: the rest the sources contradict, and the documents

Code and config:
- C-M7: a DMARC report's explicit <pct>0</pct> stays 0; only an absent
  pct takes RFC 7489 § 6.3's default 100 (Pct *int).
- C-D1: docs/development.md now tables the Debian versions the citations
  were read at (postfix 3.7.11-0+deb12u1, opendkim and libopendkim11
  2.11.0~beta2-8+deb12u1, libmilter1.0.1 8.17.1.9-2+deb12u2, libsasl2-2 and
  sasl2-bin 2.1.28+dfsg-10, supervisor 4.2.5-1, logrotate 3.21.0-1 - read off
  the image with dpkg-query, 2026-10-15); the e2e stand's new
  checkCitedPackageVersions fails when the image it built differs.
- C-E2: the e2e zone's SOA serial only grows (CoreDNS v1.14.6's file
  plugin reloads on a grown serial, not on mtime); Corefile comment says
  so; TestZoneSerialGrows.
- C-K8, C-K9: the e2e compose and stage comments say how
  --project-directory and .env resolve.
- D-arch:154: postfix-config.sh's "Postfix insists" comment says what
  TLS_README advises and that smtpd reads the key as root.
- B-G7: inflight.go's reservationTTL comment: a dropped client does give
  ABORT (smtpd_proto() -> mail_reset() -> milter_abort()); the TTL is for
  smtpd dying or the milter connection breaking.
- D-guide:301: the nginx fragment's first-certificate command now reaches
  certbot (--entrypoint certbot, --standalone, port 80 free), and the
  renewal loop passes --webroot -w /var/www/certbot - a standalone
  certificate would otherwise renew standalone while nginx holds port 80
  (certbot docs, "Renewing certificates": the issuing plugin is used
  "unless you specify other plugins or options", and options of a
  successful renewal are saved). The register's proposal missed that.

Documents: every D-arch, D-guide and D-sec claim the register's Answers E
found false or partly true, rewritten - by three Sonnet agents, one per
document, then reviewed: two proposals were obsolete after this stage's
fixes and not used (a bounce's From: line - extract_from = "smtp" now;
"Origin: null" - Referrer-Policy is same-origin now); a stand
observation the agent had dated from a commit is now tied to the e2e test
that checks it; the SQLite writers paragraph describes _txlock=immediate;
the log tailer's rotation paragraph describes the minute's grace; the
guide's nginx steps were put in working order (links and modes before
`up`, no reconfigure step). "Deferred" is kept for Postfix's queue in the
guide too. guide.md's CRLF from the agent normalised.

Stand (2026-10-15, make e2e, exit 0, the version gate and zone serial
test included); go vet and go test ./... pass on the server (24 packages).

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

docs/development.md

@@ -234,9 +234,29 @@ what it relies on and where that is written, for the version the image runs
 
 The Debian sources of the image's versions are fetched with `apt-get source`
 inside a `debian:bookworm` container (`postfix`, `opendkim`, `cyrus-sasl2`,
-`supervisor`, `logrotate`); `dev/upstream/` (not in git) is where they are
-kept for reading. Go modules are read in the module cache at the version
-`go.mod` pins.
+`supervisor`, `logrotate`, and `sendmail` for libmilter); `dev/upstream/`
+(not in git) is where they are kept for reading. Go modules are read in the
+module cache at the version `go.mod` pins.
+
+The image takes `debian:bookworm-slim` and installs without pinning (pinned
+Debian versions leave the mirrors), so a rebuild after a point or security
+release runs packages the citations were not read against. The versions
+read are these; the e2e stand compares them with `dpkg-query` in the image
+it built (`checkCitedPackageVersions`), and a difference fails the run -
+re-read what changed, update the citations, then this table:
+
+<!-- cited-package-versions -->
+| Package | Version read |
+|---|---|
+| `postfix` | `3.7.11-0+deb12u1` |
+| `opendkim` | `2.11.0~beta2-8+deb12u1` |
+| `libopendkim11` | `2.11.0~beta2-8+deb12u1` |
+| `libmilter1.0.1` | `8.17.1.9-2+deb12u2` |
+| `libsasl2-2` | `2.1.28+dfsg-10` |
+| `sasl2-bin` | `2.1.28+dfsg-10` |
+| `supervisor` | `4.2.5-1` |
+| `logrotate` | `3.21.0-1` |
+<!-- /cited-package-versions -->
 
 A document instead of source: its URL and section. Where neither answers the
 question, the comment says so and what was measured instead - "measured on