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/audit-2026-10-12.md

@@ -1015,12 +1015,17 @@ those after it move up one patch number each.
    mounted read-only at the same path; certbot's own `chmod 0755` and
    `chgrp`/`chmod 0640` for a server that is not root (kept on renewal) let the
    panel read them; no copying hook.
-- [ ] **The rest of what the sources contradict** (C-M7 `<pct>0</pct>`,
+- [x] **The rest of what the sources contradict** (C-M7 `<pct>0</pct>`,
    C-E2 the e2e zone serial, C-D1 a release gate comparing the image's
    package versions with the ones cited, C-K8/K9 and the comments the
    answers name), and **the documents**: every claim of architecture.md,
    security.md and guide.md the answers find false or partly true is
    rewritten as the answers propose (D-arch, D-sec, D-guide). - **Sonnet**
+   *Done 2026-10-15:* the release gate is `checkCitedPackageVersions` (e2e)
+   against the table in development.md; the documents by three agents, one
+   per document, reviewed. Two register proposals were outdated by this
+   stage's fixes (a bounce's `From:` line, `Origin: null`) and not used; the
+   nginx renewal needed `--webroot` in the loop, which the register missed.
 - [ ] **What only the stand can answer** (A-43, C-K5, C-M8, C-X1, D-S7,
    D-B16 and the document claims marked so): postlog's set-gid in the
    image; the client address Postfix sees through Docker's port publishing