## Summary
The version/commit badge currently rendered in the nav stats bar
(alongside packet counts, node counts, and observer counts) is
operator-facing diagnostic information — not something end users need
visible on every page load. For most visitors, it adds visual noise
without adding value.
## Changes
- **perf.js**: Add a **Version** card to the Perf dashboard overview
row. Shows `version` + short `commit` hash, both already available from
`/api/health` (no new API surface needed). Card renders conditionally —
if neither field is set it stays hidden.
- **app.js**: Remove `formatVersionBadge()` and `formatEngineBadge()`
helper functions (now unused); strip the badge call from
`updateNavStats()` so the navbar shows only packet/node/observer counts.
- **style.css**: Remove now-dead `.nav-stats .version-badge`,
`.nav-stats .engine-badge`, and their link sub-rules.
## Rationale
The Perf page is explicitly the right place for this information — it's
already scoped to operators and developers who want to know what version
is running. The navbar is a high-visibility surface shared by all users;
version strings belong in a diagnostic context, not a navigation bar.
Net result: navbar is cleaner for end users; operators can still find
version info immediately on the Perf tab.
When engine=go, the perf page now renders Go-specific runtime stats
(goroutines, GC collections, GC pause times, heap breakdown, CPUs)
instead of the misleading Node.js Event Loop metrics. Falls back to
the existing Node UI when engine is not 'go' or goRuntime data is
missing. Includes color-coded GC pause thresholds.
fixes#153
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Eric Muehlstein