Add feature batch: captive-portal detection, schedules, exit-node failover, 802.1x, per-network DNS
Implements the planned feature sweep: tri-state connectivity with portal
detection, time-based profile schedules, priority exit-node list with
failover, enterprise (802.1x) network support, per-network DNS, signal-
aware selection, auto-learn markers, suspend/resume recovery, prune
command, scored detection, and richer bread events (network.changed,
tailscale.changed). CLI gains --json output, init --wait, and add --dns/
--eap/--identity/--ca-cert. Adds regression coverage for each feature;
141 tests pass and clippy is clean with -D warnings.
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Co-Authored-By: Codebuff <noreply@codebuff.com>
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