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/health/liveness.go

@@ -0,0 +1,46 @@
+package health
+
+import (
+	"fmt"
+	"strings"
+)
+
+// mailPathPrograms are the supervised processes whose absence means the
+// container should not report healthy to orchestrators.
+var mailPathPrograms = map[string]bool{
+	"opendkim": true,
+	"panel":    true,
+	"postfix":  true,
+}
+
+// Liveness reports whether the mail path is healthy enough for container
+// probes. It requires opendkim, panel, and postfix to be RUNNING under
+// supervisord.
+func Liveness() error {
+	procs, err := Processes()
+	if err != nil {
+		return err
+	}
+
+	seen := make(map[string]Status, len(mailPathPrograms))
+	for _, p := range procs {
+		if mailPathPrograms[p.Name] {
+			seen[p.Name] = p.Status
+		}
+	}
+
+	var unhealthy []string
+	for name := range mailPathPrograms {
+		switch seen[name] {
+		case StatusOK:
+		case StatusUnknown:
+			unhealthy = append(unhealthy, name+": missing")
+		default:
+			unhealthy = append(unhealthy, fmt.Sprintf("%s: %s", name, seen[name]))
+		}
+	}
+	if len(unhealthy) > 0 {
+		return fmt.Errorf("unhealthy: %s", strings.Join(unhealthy, ", "))
+	}
+	return nil
+}