callSounds.ts had no tests despite 106 lines of user-facing audio logic. Adds 13
tests (mocking AudioContext) pinning: the chime/soft/retro join+leave melodies
(frequencies, oscillator types, stagger), the click-avoidance gain envelope and
osc->gain->destination wiring, and the defensive contracts — unknown style is a
no-op that never creates a context, a throwing AudioContext constructor is
swallowed, and the shared context is reused / recreated-when-closed / resumed-
when-suspended. Suite is now 527 tests; refreshed the stale count in LOTUS_BUGS.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
