Replaces the single-packet `stun` test with two predictive voice tests:
- voice-quality: 30-packet STUN burst through the SOCKS5 UDP relay.
Computes loss%, jitter (RFC-3550-ish mean abs of inter-arrival
delta), p50/p95 RTT. Three-tier gating: pass (loss≤5%, jitter≤30,
p50≤250), warn (loss≤15%, jitter≤60, p50≤400 — voice glitches but
works), fail (anything worse, including 100% loss).
- voice-srv: parallel-DNS the 16-region <region>.discord.media
hostnames, then SOCKS5 CONNECT to :443 on each through the proxy.
Catches the very common Russian-DPI failure mode where the proxy
passes generic Discord.com TCP but blocks the .discord.media voice
CIDRs — a regression all 5 prior SOCKS5 sanity checks miss.
New StatusWarn = "warn" — soft pass with Hint kept visible. Counted as
passed in summary but flagged in UI.
Config gains VoiceBurstCount (default 30), VoiceBurstInterval (default
20ms), VoiceServerHostnames (default = built-in 16-region list).
Tests cover happy path, warn-tier (10% drop), fail-tier (100% drop),
voice-srv blocked, plus standalone unit tests on
runVoiceQualityBurst and runVoiceServerProbe with a fake UDP relay
and fake SOCKS5 server. Race + cover stays at 82.4%.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Adds:
- retry.go: classifyError() splits errors into Permanent vs Transient
(used to gate auto-retry); isContextErr() detects ctx cancellation
through wrapping (OpError, errors.Join).
- hints.go: hintFor(testID, err) returns short Russian explanation per
failure step, with dedicated branches for SOCKS5 sentinels, every
documented REP code (0x01..0x08), STUN sentinels, timeouts, and a
friendly-name fallback.
Coverage: retry.go 100%, hints.go 100%; package total 94.2%.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
root