findings of the reviews of audit stage 1

Technical review (Opus) and security review (Fable) of 9efc9c7..a59e3d4;
reports in the session's scratchpad. Fixed:

- B1 (verified bug): store.UpdateStatus read before writing in its
  transaction; a commit by another connection in between (the dmarc-ingest
  process opens the same file) failed it at once with "database is locked"
  and the delivery line was lost. The first statement is now a write.
- R3: a delivery line updated every row of its queue id and recipient; it
  now updates only the newest (Postfix reuses short ids). The sweep closes
  by row id (QueuedDelivery.ID, CloseUnreported(id)).
- R4: a contradicted sweep keeps a mark, reason "reconcile-contradicted",
  instead of losing which row it was.
- R1: contradicted cannot see a lost line (never read late). New counter
  reconcile_missed: at close, the sweep looks for the row's delivery line
  in mail.log and mail.log.1 (QueueLines). 0007 edited - it has run on no
  database but throwaway stands.
- R2: queued_over_lifetime cannot measure "what removing the sweep would
  leave" while the sweep runs; its text now says rows stuck despite the
  sweep, and the rule uses closed - missed - contradicted.
- cert-reload (R5, R6, R7, security medium/low): both files copied to .new
  and the copies checked as a pair before both are renamed; acts on the copy
  only when postconf says Postfix reads it; a failed reload is retried next
  pass; umask 077; says so when the mounted files cannot be read. The e2e
  case asserts Postfix reads the copy, the copy equals the mount, the key is
  600 root.
- Security low: a recipient with a quoted local part - the journal cut
  "a b"@x at the space, deliveryRe cut "a>b"@x at the ">" - matched no
  delivery line and was closed by the sweep. cleanAddress ends a bracketed
  address at the first ">" outside quotes; deliveryRe takes the recipient
  up to the ">, " before relay= (test fixtures given the relay= every real
  delivery line has).
- Security low: postqueue -p's error carries at most 512 bytes of output.
- Nits: addDeliveryLogDay refuses a column not on its list; the truncation
  test checks its message.
- To stage 2b (page wording, mockup-first): the history step of a bounced
  row says the receiving server refused it, false for a row the sweep
  closed. To the owner when stage 2b is reached: since M13 the "deferred"
  figure counts whole messages too, which "Connections turned away" would
  not name.

Found while verifying: the e2e's main positive path failed once with "553
not owned by user app1" - an smtpd idle from before the panel's reload took
the connection in the reload's second. Measured on the stand (one-off
probe, not committed): sending 0, 10, 40, 110 s after the save (two seconds
at the soonest) always met an smtpd started after the reload. The e2e now
waits for the sender map after each application it creates
(waitForSenderMap: AUTH, MAIL, RCPT, RSET - no message, no row), and the
level-1 case uses it instead of its own loop.

Docs: architecture § Queue reconcile, schema-migrations (rows 7 and 8,
chain head 8), CHANGELOG, audit plan (stage 1 note, the measured window,
a new stage 2b line: 62 lines), roadmap 15/62.

Evidence on the test server for this tree: go vet clean, go test ./... 23
packages ok, make e2e exit 0 (renewed certificate, hung panel, level 1 at
49/60).

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

internal/postfix/queue.go

@@ -62,7 +62,13 @@ func listQueue() (text string, truncated bool, err error) {
 		return "", false, fmt.Errorf("postqueue -p timed out after %s", postqueueTimeout)
 	}
 	if err != nil {
-		return "", false, fmt.Errorf("postqueue -p: %w: %s", err, strings.TrimSpace(out.buf.String()))
+		// stdout and stderr share the buffer: the end of it says why, and up
+		// to 4 MiB of listing does not belong in an error.
+		why := strings.TrimSpace(out.buf.String())
+		if len(why) > 512 {
+			why = "..." + why[len(why)-512:]
+		}
+		return "", false, fmt.Errorf("postqueue -p: %w: %s", err, why)
 	}
 	return out.buf.String(), out.truncated, nil
 }

internal/postfix/queue_test.go

@@ -49,8 +49,8 @@ func fakePostqueue(t *testing.T, size int) {
 // The queue page still shows the cut listing, with the note.
 func TestQueueIDsRefusesATruncatedListing(t *testing.T) {
 	fakePostqueue(t, 5<<20)
-	if ids, err := QueueIDs(); err == nil {
-		t.Fatalf("QueueIDs on a 5 MiB listing = %d ids and no error, want an error", len(ids))
+	if ids, err := QueueIDs(); err == nil || !strings.Contains(err.Error(), "listing is larger than") {
+		t.Fatalf("QueueIDs on a 5 MiB listing = %d ids, %v; want the listing refused for its size", len(ids), err)
 	}
 	text, err := Queue()
 	if err != nil {