Add a grpcRun helper that wraps cobra RunFuncs, injecting a ready
gRPC client and context. The connection lifecycle (cancel, close)
is managed by the wrapper, eliminating the duplicated 3-line
boilerplate (newHeadscaleCLIWithConfig + defer cancel + defer
conn.Close) from 22 command handlers across 7 files.
Three call sites are intentionally left unconverted:
- backfillNodeIPsCmd: creates the client only after user confirmation
- getPolicy/setPolicy: conditionally use gRPC vs direct DB access
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