Field case 2026-08: the display isolate invalidated the only real render
endpoint; the mic held the Steam Streaming Microphone, the Speakers were
blacklisted, and the capture loop re-ran the full wiring pass — three
IPolicyConfig SetDefaultEndpoint writes included — every 2 s for 8+
minutes, retrying a verdict that could never change.
- wiring_plan: a plan with no loopback is a typed structural verdict
(Wiring::loopback_unsatisfiable + an endpoint-set fingerprint); the
dead leftover() tier (byte-identical to real_hw()) becomes a real last
resort that accepts ONLY the Steam Streaming Speakers, flagged
loopback_last_resort — a known-silent-loopback QUALITY risk, never the
cable/VoiceMeeter echo CORRECTNESS risks. excluded_from_loopback stays
untouched (judge_default's mid-stream snap-back semantics).
- wasapi_cap: an unsatisfiable plan errors ONCE per topology with the
render inventory, per-endpoint rejection reasons and only the remedies
not already taken, then parks on a cheap enumerate-and-hash poll and
re-plans the instant the set changes; transient failures get a real
capped exponential backoff (2 s → 60 s, reset on success or set
change); a last-resort capture re-plans on any set change and promotes
the 30 s zero-packet breadcrumb to warn.
- audio_control: the recording default is asserted only when the plan
changed or the default drifted — set_default_endpoint fires all three
SetDefaultEndpoint roles unconditionally, so the 2 s loop silently
stomped any operator recording-device change; the "attach one, or let
the host install the Steam Streaming pair" warn (already satisfied in
the field case) is replaced by the same diagnosis.
Verified: 19/19 wiring_plan tests (native rustc --test and the Linux CI
image via docker); both Windows files type-check and clippy clean
against wasapi 0.23.0 / windows 0.62.2 for x86_64-pc-windows-msvc via an
xcheck-style stub harness (the in-tree target check dies in
openh264-sys2's build script on macOS, as scripts/xcheck.sh documents).
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
enricobuehlerandClaude Fable 5
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