Drop redundant default cases from exhaustive liveness switches

All three switches consume ProcessLivenessVerdict/ProcessSignalEvidence values
constructed in-process by inspectProcessSignal/inspectProcessLiveness; the union
is never deserialized from a wire, RPC, or persisted record, so the defaults are
genuinely unreachable.

src/main/daemon/daemon-host-relocation.ts

@@ -373,8 +373,6 @@ export function pruneOldDaemonHosts(evidence: PinnedDaemonVersionsEvidence): voi
         continue
       case 'exited':
         break
-      default:
-        verdict satisfies never
     }
     try {
       rmSync(join(root, entry.name), { recursive: true, force: true })

src/main/daemon/daemon-process-inspection.ts

@@ -43,8 +43,6 @@ export function inspectProcessLiveness(pid: number): ProcessLivenessVerdict {
       return { status: 'exited' }
     case 'unavailable':
       return { status: 'unverifiable', reason: 'the daemon process could not be queried' }
-    default:
-      return signal satisfies never
   }
 }
 
@@ -59,8 +57,6 @@ export function mergeProcessLivenessVerdict(
       return current?.status === 'live' ? current : next
     case 'exited':
       return current ?? next
-    default:
-      return next satisfies never
   }
 }