chore: add post-v1.0 roadmap milestones

ROADMAP.md

@@ -29,6 +29,53 @@ The path to v1.0.0 is staged: first achieve feature parity with `solid_queue_das
 
 ---
 
+## v1.1 — Error Intelligence
+
+> _Surface patterns in failures, not just individual failed jobs._
+
+- **Error frequency report** — group all failed jobs by error class + message prefix; show count and a sample backtrace; makes "ArgumentError (x212), TimeoutError (x88)" visible at a glance without clicking into each job
+- **Failed job trend chart** — "Failures — Last 12 Hours" sparkline on the queue dashboard overview card; makes failure spikes visible before you click into the failed jobs list
+- **P99 + standard deviation in performance stats** — extend the stats table with a 99th-percentile and std-dev column; high std dev signals inconsistent jobs worth investigating
+
+---
+
+## v1.2 — UX Polish
+
+> _Quality-of-life improvements for teams using the dashboard daily._
+
+- **Sortable columns on jobs, failed jobs, and history** — server-side `?sort=&dir=` params matching the pattern already used for cache entries and stats
+- **Sticky filter preferences** — persist last-used status, period, and queue filter to `localStorage` so filter state survives page reloads
+
+---
+
+## v1.3 — Alerting Depth
+
+> _More signals, fewer blind spots._
+
+- **Slow job webhook alert** — fire when the slow-job count crosses a configurable threshold; pairs with the existing `slow_job_threshold` config — adds the alerting half
+- **Process stale webhook alert** — fire when a worker's `last_heartbeat_at` expires; a worker going silent means jobs stop processing without any visible signal
+- **Job wait time column** — show time from `enqueued_at` to `created_at` on claimed executions; a direct measure of queue SLA (how long jobs waited before a worker picked them up)
+
+---
+
+## v1.4 — Audit & Compliance
+
+> _Requires an opt-in migration — kept separate from the no-migration-required releases above._
+
+- **Admin audit log** — record who retried, discarded, or paused what and when; needs a `solid_stack_web_audit_events` table via an engine-provided migration (`rails solid_stack_web:install:migrations`); identity comes from the `authenticate` block; CSV export included
+
+---
+
+## v2.0 — Extensibility
+
+> _Breaking changes or large architectural additions._
+
+- **i18n / locale support** — wrap all user-visible strings in `I18n.t`; makes the gem usable for non-English apps
+- **Custom dashboard cards** — registration hook so host apps can inject their own stat cards alongside the built-in queue, cache, and cable cards
+- **Custom nav links** — `config.nav_links = [{ label: "Admin", url: "/admin" }]` to integrate the dashboard into the host app's navigation
+
+---
+
 ## Out of Scope (for now)
 
 - **Background job execution** — this is a monitoring engine, not a worker runner; it will never enqueue or execute jobs itself