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).

test/e2e/panel_client.go

@@ -145,7 +145,7 @@ func (c *panelClient) dkimRecord(domainID string) (name, value string, err error
 }
 
 // addApplication submits the add-application form and returns the one-shot
-// login/password the panel renders inline (spec 7.6.1 — never recoverable
+// login/password the panel renders inline (security.md — never recoverable
 // later, so this is the only place to read it).
 func (c *panelClient) addApplication(domainID, login, mode, addresses string) (appLogin, password string, err error) {
 	resp, body, err := c.postForm("/domains/"+domainID+"/applications", url.Values{
@@ -170,8 +170,9 @@ func (c *panelClient) addApplication(domainID, login, mode, addresses string) (a
 	return appLogin, password, nil
 }
 
-// setRateLimit saves a level-2 differentiated limit (spec 7.4) on either a
-// domain (/domains/{id}/ratelimit) or an application (/applications/{id}/ratelimit).
+// setRateLimit saves a level-2 differentiated limit (README § Rate limiting)
+// on either a domain (/domains/{id}/ratelimit) or an application
+// (/applications/{id}/ratelimit).
 func (c *panelClient) setRateLimit(path, allowedIP string, maxMessages, windowSeconds int) error {
 	resp, body, err := c.postForm(path, url.Values{
 		"allowed_ips":    {allowedIP},