With the opt-in auto-open on, only prompt when the player's current
physical tuning doesn't already cover the song. FeedBack is tune-to-song
(the highway draws tab in the song's tuning), so the check aligns the
song's open-string tuning string-for-string against the player's
instrument:
- An 8-string F# player gets no prompt for a 6-/7-string standard song
(its top strings already match those tunings).
- A song needing an open string the player lacks (e.g. a Drop-A
7-string's low A on an F# 8-string) still prompts.
- A whole-instrument reference difference (A440 vs A432, or an
octave-down centOffset, previously ignored) also prompts.
Reads the player's instrument from core /api/settings (the v3 instrument
selector, a stable physical reference); conservative fallback (prompt)
when undeclared or unavailable, so a real retune is never silently
skipped. v3-only. All in plugins/tuner/screen.js; no core changes.
Stacked on #655. Follow-up E1.6: a passive badge cue that names the
strings to retune, plus splitscreen / no-usable-input guards.
Tests: tests/js/tuner_auto_open.test.js (covered/uncovered, the Drop-A
case, reference mismatch, direct contiguous alignment).
Claude-Session: https://claude.ai/code/session_01QbexxfTt8q2tAn436MqGWF
Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
