Per-lane pattern length (wlen, 1..16, default 16 = full wheel) → polymeter.
Named wlen because keyroll already owns seq.len (the per-step note-length
array). One monotonic seqAbsStep counter drives wheelStep(sq), which
returns seqCurStep for full wheels (bit-identical to pre-WHEELS) and
seqAbsStep%wlen for shorter ones. Threaded through seqTick (both branches,
one cur for the gate AND len[] lookup), the S&H source sampling, and every
applyGroove call. migrateSeq clamps wlen (legacy → 16); self-check gains
wlen-default/preserve/clamp + wheel-full-identity. exportMid's drum block
is now one absolute loop (a 12-wheel exports as it plays; sa%16 keeps the
full wheel byte-identical). UI: a ☸ wheel chip in each beat lane + the
arranger euclid row; steps past the wheel dim (.off, pointer-events:none)
and the playhead paints at wheelStep. The owned() export gate is intact.
Verified: groove self-check green (incl. new assertions), full-wheel
export bit-identical over 4 bars, 12-wheel wraps at sa%12, kick-16/hat-12
drift over 48 ticks, beat-panel wheel=12 dims exactly 4 cells, zero errors.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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