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KKRainbow
8b7f1f0196
Move secure tunnel handshakes out of the listener accept path so an idle connection cannot delay subsequent device sessions. Bound pending handshakes to 4096 per listener and own them in a JoinSet for cancellation. Preserve each in-flight accept future while handling completed handshakes so listeners with transport upgrades do not lose accepted connections. Keep session registration, authentication and protocol timeouts unchanged. Add TCP regressions for idle-client isolation, manager shutdown, bounded admission and preserving an unfinished transport accept. The isolation test fails before the fix and passes afterward. Validation: all 249 easytier-web tests with --include-ignored pass. Raise the test process file descriptor limit to 16384 for the explicit 4097-connection capacity test. The default test run skips this stress test. Cargo fmt --all -- --check and cargo clippy -p easytier-web --all-targets -- -D warnings also pass. Domain context impact: none; this changes handshake scheduling only. Architecture impact: none; ClientManager retains connection ownership.