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Review found the counter still lied, one level deeper: it counted `router.push` calls, and a call is not a committed history entry. Next drops a push to `replaceState` when the canonical URL is unchanged (app-router.js, the `pendingPush && href !== canonicalUrl` branch), so clicking a self-link — the breadcrumb on an issue detail page, a pin to the issue you are on — incremented depth with no entry behind it, and a delete from there could still step off the app. Fixing the count needs per-entry markers, which means depending on both React effect ordering (our provider's effect runs before app-router's history commit) and Next's own preserveCustomHistoryState behaviour. Two rounds of review have now found holes in hand-rolled history tracking; a third layer of it is not the way to buy this guarantee. So stop deriving. `canGoBack` is the Navigation API's answer or `false`. Browsers without it take the fallback path, which is exactly what they did before any of this existed — nobody regresses, and the "wrong true walks the user out of the app" failure is now unreachable by construction. Drops the tracker, the popstate wiring and the push wrapper: the `multica:navigate` bridge returns to its original shape. Co-authored-by: multica-agent <github@multica.ai>