refine: tunnel verify - tighter retries, stderr-first on 000, announce DoH fallback

Reviewer feedback: cut worst-case stall from ~200s to ~60s (urllib 2x, DoH 4x with max-time 10); when curl reports 000 (connect failure) prefer stderr for the diagnostic; print an explicit note when falling back to DoH after a resolved-DNS urllib failure.
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2026-08-12 20:58:44 +09:00
parent e34322cc73
commit f171ce4992
2 changed files with 14 additions and 6 deletions
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