logtail: a refusal the panel did not get to write is written from mail.log (stage 2b)

The sender check answers 550 5.7.1 and writes the refused row through a
buffer a moment later; a panel stopped in between (a rollout, a kill) left
an application refused and a log that did not know it. A refusal at MAIL
FROM needs nothing: the journal milter writes its row before it answers.

- logtail.refusalLines remembers each queue id's login from smtpd's
  "<id>: client=..., sasl_username=<login>" (4096 ids at most) and, on
  cleanup's "<id>: milter-reject: END-OF-MESSAGE ...: 5.7.1 From: <line> -
  <why>; from=<...> to=<...>", waits 30 s and hands it to
  store.RecoverRefusal - an INSERT ... WHERE NOT EXISTS a refused row of that
  queue id within two minutes: the row the panel wrote, or one recovered
  before, means nothing is written. It is read from the saved offset on, so
  a kill is covered as well as a clean stop - which a flush of the buffer at
  shutdown would not.
- Migration 0009 (not deployed yet) gains send_log.recovered; the row is
  written with the line's time, the login's domain id, reason "from", the
  From: line as the check printed it (to the last " - " before ";").
- The message page: a fact "Written: from mail.log after a restart: the
  panel stopped before it wrote the refusal".

Tests: store (not written when the panel wrote it; written once however
often); logtail (the login from client=, the From: line with a " - " in it,
nothing before the wait is over); view (the fact). e2e
refusal_recovered_from_the_log: a From: refusal, the panel stopped, its row
deleted and the tailer's saved place moved before the message's first line
(python3 in the container, as the panel's user - a kill cannot be timed to
that moment from outside); started again, the row is back, recovered, once.

Also fixed: handlers TestMessagePageOfARefusedMessage still expected the
old sentence; it failed on the server after e166a2e, whose run showed only
the schema failures - now it wants the new one.

schema-migrations row 9, CHANGELOG [Unreleased], audit plan line ticked,
roadmap 26/62.
Evidence on the test server for this tree but the handler-test fix: make e2e
exit 0 (the new case 37 s); go test 22/23 ok, the 23rd that test - fixed,
passes locally; the full run follows before the push.

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

docs/audit-2026-10-12.md

@@ -793,7 +793,7 @@ order - each stands on the one before.
    `mail.log` never said what became of it, so the panel closed it as a
    failure. Wording in the mockup `out-message` first (`design:` commit),
    with the box of the step above. - **Sonnet**
-- [ ] **A refusal the panel did not get to write is written from
+- [x] **A refusal the panel did not get to write is written from
    `mail.log`** (owner, 2026-10-13, from the Not done list of
    from-header-binding; built on the step above). The check answers 550 and
    writes the row a moment later, through a buffer; a panel that stops in

docs/roadmap.md

@@ -42,7 +42,7 @@ in `git log` and [CHANGELOG.md](../CHANGELOG.md).
 | from-header-binding | Hold a message's `From:` header against the application that sends it | shipped `2.4.0` | 9/9 | [plans/from-header-binding.md](plans/from-header-binding.md) |
 | panel-redesign | Panel redesign (accepted mockups, design contract) | shipped `2.0.0` | 27/27 | [plans/panel-redesign.md](plans/panel-redesign.md) |
 | schema-squash | Squash SQLite migrations into a 2.x baseline | built in panel-redesign (stage 1) | — | [plans/panel-redesign.md](plans/panel-redesign.md) |
-| audit-2026-10-12 | Follow-ups of the 2026-10-12 full-tree code audit, seven stages | in progress (stage 0 shipped `2.4.2`, stages 1+2 `2.5.0`; next stage 2b → `2.5.1`) | 25/62 | [audit-2026-10-12.md](audit-2026-10-12.md) |
+| audit-2026-10-12 | Follow-ups of the 2026-10-12 full-tree code audit, seven stages | in progress (stage 0 shipped `2.4.2`, stages 1+2 `2.5.0`; next stage 2b → `2.5.1`) | 26/62 | [audit-2026-10-12.md](audit-2026-10-12.md) |
 
 **Recommended order** (not binding; owner, 2026-10-09: feature order follows
 development convenience): **panel-redesign** shipped as `2.0.0` (2026-10-11) and

docs/schema-migrations.md

@@ -83,7 +83,7 @@ audit (`2.5.0`).
 | 6 | `0006_sender_check.sql` | 2.4.0 | DDL | `send_log.reason` and `send_log.header_from` (both default `''`: a row refused earlier keeps no reason), and `sender_check_days` |
 | 7 | `0007_delivery_log_days.sql` | 2.5.0 | DDL | `delivery_log_days`: what the reconcile sweep and the log tailer did, a row per UTC day, kept a year, shown nowhere - the measurement that decides the sweep's fate (audit 2026-10-12, stage 1). `send_log.reason` gains the values `reconcile` and `reconcile-contradicted` without a schema change |
 | 8 | `0008_tenant_boundary.sql` | 2.5.0 | DDL + data | `idx_applications_login_nocase`: an application login is unique without regard to case (audit 2026-10-12, H4). `send_log.domain_id` and `inbound_spam_log.inbound_domain_id` (`ON DELETE SET NULL`), each with an index, filled once by name from the registry as it was then: a row belongs to a domain by id, and a domain deleted and added again starts with an empty log (L12) |
-| 9 | `0009_refusal_line.sql` | 2.5.1 | DDL | `send_log.refusal_line`: Postfix's line about a refusal at MAIL FROM (a level-2 limit, a client address off the list), which has no queue id; the log tailer puts it on the row (audit 2026-10-12, stage 2b) |
+| 9 | `0009_refusal_line.sql` | 2.5.1 | DDL | `send_log.refusal_line`: Postfix's line about a refusal at MAIL FROM (a level-2 limit, a client address off the list), which has no queue id; the log tailer puts it on the row; and `send_log.recovered`, a refusal row the tailer wrote from `mail.log` because the panel stopped before writing it (audit 2026-10-12, stage 2b) |
 
 **Kind:** *DDL* — schema only; *data* — `INSERT`/`UPDATE` that must stay correct
 for operators upgrading from older 2.x images.