Bound daemon loss classification probes

[lawrencecchen]

Follow-up to #11062.

Adds a fixed request deadline to both existing-tree and fallback reconnect probes, so synchronous request waits are bounded and pending requests are removed on timeout.

Tokio reference: https://docs.rs/tokio/latest/tokio/time/fn.timeout.html

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Summary by cubic

Bounds daemon loss classification probes so reconnect checks no longer hang when a daemon stops responding. Previously the existing-tree refresh and fallback reconnect probe could block indefinitely on the refresh lock, connection, or synchronous requests; now both share a single 500ms deadline across connect, transport setup, initialization, and tree refresh, with pending requests dropped on timeout.

^{Written for commit befc239. Summary will update on new commits.}

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Project	Deployment	Actions	Updated (UTC)
cmux166	Ready	Preview	Aug 28, 2026 11:17pm
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