0.17.3: daemon self-heal on missing-daemon fetch failure

In 0.17.x the daemon is a separate process that can idle-shut-down
(10 min idle) or be killed externally while Pi sessions are running.
Without self-heal, the next /chrome onboard or chrome_* call surfaces
'fetch failed' instead of recovering.

bridge.admin() now catches the failed fetch, re-runs ensureDaemonRunning
(probe -> spawn if missing), and retries once.

bridge.sendViaOwner() pre-probes /status and spawns the daemon if missing
before issuing the signed /command.

Net effect: a missing daemon transparently respawns instead of bubbling
fetch failed up to the user.

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