docs: roadmap checklists, Progress column, commit/version protocol

Co-authored-by: Cursor <cursoragent@cursor.com>

docs/plans/send-log-retention.md

@@ -122,3 +122,18 @@ Domain administrators keep the narrow credentials-only settings page.
   stale int from panel start only.
 
 **Version:** `1.x` MINOR.
+
+## Implementation checklist
+
+Target version cut: **`1.5.0`** (MINOR). One commit per step; code only after
+roadmap status is **agreed**. See [development.md](../development.md) § Plan
+checklists.
+
+- [ ] `GetSendLogRetentionDays` / `SetSetting` key `send_log_retention_days` (7–365) — **Opus**
+- [ ] Bootstrap from `SEND_LOG_RETENTION_DAYS` when settings empty — **Opus**
+- [ ] `logtail.retentionLoop`: read setting each prune cycle — **Opus**
+- [ ] Settings card on `/settings` (`settings.html`) — **Sonnet**
+- [ ] Remove hardcoded «ninety days» in handlers and templates — **Sonnet**
+- [ ] Tests: save/load, range, loop without restart — **Sonnet**
+- [ ] [guide.md](../guide.md) — **Sonnet**
+- [ ] `go vet`, `go test` on touched packages — **Haiku**