Patch release dependencies and Go security fixes

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Markus1mo ago

Use Go 1.26.8, gRPC 1.83.2 and its required module closure. Patch the imported S2 dictionary issue and replace deprecated Dial calls.

Add real proxy status RPC and stalled-handshake deadline regressions. Verified full vet/test/race, cross-builds and live PTY on Go 1.26.8. Govulncheck reports no symbol, package or module findings.