Pre-warm the app plane on requests that do not need it

[RhysSullivan]

Cold app-plane dispatches are the largest share of dashboard latency: 30% of /api/* requests land on an isolate that has not evaluated the app graph and pay ~2 s (p50) against ~100 ms warm. Only 43% of those isolates are under 5 s old. The rest have been alive serving /mcp, discovery documents, or proxies, none of which enter the app graph.

This change starts the app-plane import in the background (ctx.waitUntil) on any request that does not itself need it, including the every-minute cron, so a dashboard call arriving later on that isolate finds the graph evaluated. The import is memoized as a promise so a pre-warm and a real request racing on a fresh isolate share one import; a failed import is not memoized.

Expected effect: the entered=false share of worker.dispatch spans with executor.dispatch.plane=app drops from ~30% toward the fresh-isolate floor (~13%). The truly fresh isolate still pays; that is the graph's own evaluation cost and is a separate change (moving the MCP session Durable Object's imports behind a lazy boundary).

Verification after deploy, Axiom, executor-cloud dataset:

['executor-cloud'] | where name=="worker.dispatch" and tostring(['attributes.custom']['executor.dispatch.plane'])=="app"
| extend entered=tostring(['attributes.custom']['executor.app_graph.entered']), ms=duration/1ms
| summarize n=count(), cold=countif(entered=="false"), p50=round(percentile(ms,50)), p95=round(percentile(ms,95)) by bin(_time,1h)

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