Add spawn_tap_teardown (tap_engine.rs) — hands the 750ms bounded
close_tx-then-abort sequence to a tokio task instead of running it
inline via block_on on the media thread. The old Delete arm blocked
the 20ms tick loop for EVERY live call on the node whenever one
session's brain was unresponsive; teardown is brain I/O and must
never run on the timing thread. Rewire MediaCmd::Delete to call it.
TDD: new test spawn_tap_teardown_returns_immediately_and_aborts_stuck_engine
asserts (a) the call returns in <100ms even with a permanently-stuck
engine task, and (b) the stuck task is aborted within the 750ms+slack
cap, observed via a Drop-guard channel.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_012QndwfhjyTiZcUYp87dwW8
Signed-off-by: Aaron D. Lee <himself@adlee.work>
Aaron D. Lee
a53fb8a510