v0.7.1: OCTV's bottom position is the full range without the detent (#18)

[Worldwave]

Closes #18.

What changes

The bottom 1/11 of OCTV (PLAITS SETTINGS F1) is no longer Plaits' LFO range. It is now the full range without the centre detent, with or without MIDI. F1 sweeps through C4 without the detent's flat spot and can be set finely around it.

• Scale quantizer: works at the bottom position exactly as at the top. The detent and the scale are independent.
• V/Oct routing: routing a Marbles output to V/Oct still sets the top of OCTV (full range, detent on), whichever position OCTV was on.
• MIDI: a FREQUENCY CC moves pitch at 96 semitones per travel there, the same as the full range. CC 102 still steps through all eleven positions.
• CPU: no change. The LFO code path is removed and nothing is added.

Verified

• Host: all nine suites pass. New checks in routetest (bottom of OCTV vs the top, with major selected) and miditest §14 (bottom of OCTV with MIDI active). Both fail against the old code.
• Build: 427 644 B (46.82 % of the slot), 0 warnings, check_image.py passes, _vector_table at 0x20000. Fallback config: 86 556 B, passes.
• Hardware: tested by Adara on the v0.7.0-numbered build of the same change. Its log shows 0 fails and 0 stream resets over 36 windows, with the worst window at 83 % max. One 104 % block appeared in the first window after ON; it was there before this change too (BUG: Audio dropout when switching engines around Particle, String and Modal #36).

Docs

UI-SPEC v0.16, UI-PAGES and DEFAULTS. The manual is updated separately.

Version bumped to v0.7.1 (firmware/VERSION, README, the issue templates).

🤖 Generated with Claude Code