release: 2.0.1: DMARC ingest drops and bounds; Full backup from the panel

A patch on 2.0.0, all of it found on the test server after the cut:
  - a message that is not a report this relay keeps is dropped at once
    instead of being retried for days;
  - a report is bounded before it is stored, and reports are kept per
    domain (security review of the ingest path, nothing Critical or High);
  - Full backup from the panel works (it had answered 200 with ten bytes
    since 1.3.0);
  - no backup holds the Postfix queue, and the panel says why.

Cut: CHANGELOG [Unreleased] -> [2.0.1]; image pin 2.0.1 in compose,
README, guide; version table.

On the test server, on dd0fefd: go vet ./... ok, go test ./... ok
(22 packages), make e2e ok.

Full detail: CHANGELOG.md (2.0.1).

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

docs/development.md

@@ -107,7 +107,7 @@ than the default «meaningful step» rule in [§ Commits and release build](#com
 2. Git tag `vX.Y.Z` and publish the GitHub Release only on explicit request (see
    [§ Release image](#release-image)).
 
-**Planned version cuts** (from pin `2.0.0`; adjust if semver changes mid-track):
+**Planned version cuts** (from pin `2.0.1`; adjust if semver changes mid-track):
 
 | Stage | ID | Cut |
 |---|---|---|
@@ -124,7 +124,8 @@ than the default «meaningful step» rule in [§ Commits and release build](#com
 | 11 | panel-redesign plan: component kit, stages, reorder (docs only, owner-requested cut) | `1.9.4` (PATCH) |
 | 12 | GHCR release fix: keep per-arch images, sweep orphaned versions (CI only) | `1.9.5` (PATCH) |
 | 13 | panel-redesign | `2.0.0` (MAJOR, no compatibility) |
-| 14 | inbound-antispam-panel | `2.1.0` (planned; was `1.10.0`, reordered 2026-10-09) |
+| 14 | DMARC ingest drops and bounds, full backup from the panel, no queue in a backup | `2.0.1` (PATCH) |
+| 15 | inbound-antispam-panel | `2.1.0` (planned; was `1.10.0`, reordered 2026-10-09) |
 
 Docs-only prep (checklists in plans, no product code) uses the same per-step
 commit rule but **no** version cut until the next product stage ships.

docs/guide.md

@@ -183,7 +183,7 @@ cat ./data/setup-token
 #### Fixed image tag
 
 `deploy/docker-compose.yml` pins an explicit version (`ghcr.io/mixeme/selfpost:X.Y.Z`),
-deliberately never `:latest`. The current pin is `2.0.0`. Intermediate
+deliberately never `:latest`. The current pin is `2.0.1`. Intermediate
 CHANGELOG sections (`0.2.0`…`0.6.0`) record development cuts from before that
 image was published. Pinning matters because of the backup version check (see
 [Full backup and restore](#full-backup-and-restore)): the panel binary's