release: 0.5.0: Pre-1.0 security review, domain-admin role, doc consolidation

A bounce could be recorded as a successful delivery. The log-tailer's
Fixed:
  - A bounce could be recorded as a successful delivery. The log-tailer's
  - Log-tailer resumes where it stopped instead of jumping to end-of-file on
  - Level-2 rate limit no longer overshoots under concurrency: messages that
Changed:
  - The project has a single public home: `github.com/mixeme/selfpost`. Codeberg
  - Code comments no longer cite the archived specification. References like
  - `docs/code-review.md` is gone. Its plan is finished — phases 0 (bar the
  - `docs/architecture.md` gained a *Code layers* section: a diagram of
  - Phase 1 doc/code hygiene (`docs/code-review.md`): removed ~30 stale
  … (1 more in CHANGELOG)
Security:
  - Pre-release security review (plan § D, model Fable, 2026-08-06): full pass
  - `saslpasswd2` argv: the application login is now passed after a `--`
Added:
  - Optional password encryption for the two secret-bearing downloads (plan
  - Domain import accepts an encrypted export: the envelope is detected by its
  - `selfpost-backup` writes encrypted archives and reads them back:
  - `TestParseDelivery` covers the exotic mail.log shapes the review asked for
  - docs: README *Encrypting a backup or export*; `docs/security.md` §
  … (14 more in CHANGELOG)
Removed:
  - docs: `security.md` — accepted risk «restore old backup revives session rows»
Changed:
  - docs: `implementation-plan.md` trimmed to the sole open v1.x gate — pre-release
  - docs: `architecture.md` — sessions (SQLite, idle renew, password change),
  - docs: `development.md` — expanded e2e stack and `release.yml` matrix workflow.
  - docs: `security.md` — accepted risk for send-log rows stuck at `queued` after
  - docs: `roadmap.md` — optional send-log / `mail.log` follow-ups under v1.x tail.
  … (10 more in CHANGELOG)

Full detail: CHANGELOG.md (0.5.0).

internal/postfix/queue.go

@@ -6,12 +6,12 @@ import (
 	"strings"
 )
 
-// Queue returns Postfix's own human-readable mail-queue listing (spec 7.2.11):
-// active, deferred and held messages, exactly as an administrator would see
-// via the CLI. The command takes a single fixed flag and no user input, so it
-// never goes through a shell (spec 7.6.3). The panel is responsible for
-// escaping the output before display (spec 7.6.7); this function returns it
-// as-is.
+// Queue returns Postfix's own human-readable mail-queue listing
+// (architecture.md § Panel HTTP surface): active, deferred and held messages,
+// exactly as an administrator would see via the CLI. The command takes a
+// single fixed flag and no user input, so it never goes through a shell
+// (security.md). The panel is responsible for escaping the output before
+// display (security.md); this function returns it as-is.
 func Queue() (string, error) {
 	cmd := exec.Command("postqueue", "-p")
 	out, err := cmd.CombinedOutput()