Rhythm Patterns

TECHNICAL_GUIDE.md

@@ -131,9 +131,15 @@ The active voicing selector compares complete paths with dynamic programming ove
 
 Silent spans retain the preceding hand position. A continuous accompaniment repeat includes the last-to-first transition. Source-harmony variants, such as relocated pickup harmony, are solved between fixed canonical neighbors without mutating a shared previous-grip state; request order cannot change them. Per-span composition reports include candidate counts, selected family, bass/string family availability, selected positions, bass degree and movement, plus `fret_span`, `span_group` and `span_candidates` (primary/fallback counts before dominance reduction). These are diagnostic sidecar fields; the score/runtime format is unchanged.
 
-`comping_rhythm.py` selects recurring source-only figures from version 5 of `composition/accompaniment.json`. The normal acoustic cycle has two two-bar slots; electric has four. Each template and anticipation mode is evaluated at every occurrence of its slot before retrieval limits apply. Up to eight diverse candidates per slot enter bounded complete-cycle comparison. Distinct slots differ in attack/duration relationships, not just IDs, bass/upper assignments or anticipation flags. Repetition is not penalized. The source melody and harmonic rhythm affect selection; title, iteration, generated solo and tempo do not. `groove_cycles` reports slot identities, anticipation modes, aggregate cost, compared cycles and any reduction caused by vocabulary or form length.
+`comping_rhythm.py` selects recurring source-only figures from version 6 of `composition/accompaniment.json`. The normal acoustic cycle has two two-bar slots; electric has four. Each template and anticipation mode is evaluated at every occurrence of its slot before retrieval limits apply. Up to eight diverse candidates per slot enter bounded complete-cycle comparison. Distinct slots differ in attack/duration relationships, not just IDs, bass/upper assignments or anticipation flags. Repetition is not penalized. The source melody and harmonic rhythm affect selection; title, iteration, generated solo and tempo do not. `groove_cycles` reports slot identities, anticipation modes, aggregate cost, compared cycles and any reduction caused by vocabulary or form length.
 
-The cycle begins at the first full source-body measure. A partial-form entry slices the corresponding figure instead of restarting it; an odd final bar uses the appropriate half-pattern. Meter changes restart a compatible cycle. Unsupported durations fail explicitly, and limited vocabularies report a shorter cycle. Optional final-harmony changes rebind the same selected pattern. Canonical grips are fixed wherever the chord and interval start remain unchanged, so a new turnaround cannot move neighboring unaffected voicings.
+Meter-specific full patterns declare `meter` and, for 5/4, `grouping: [3, 2]` or `[2, 3]`; `meter: partial` marks the bounded one-bar pickup vocabulary. The loader checks nominal lengths, grouping, quarter/eighth arithmetic, lane overlap and distinct acoustic/electric onset patterns. Each role has 24 distinct attack/duration figures per selectable pool: 4/4 (11 families), 3/4 (12 families), and each 5/4 grouping (12 families). The 4/4 pool removes one duplicate acoustic figure, develops another previously duplicated answer, and adds three electric variants. Patterns are independently authored from general principles, with research URLs and provenance in the resource, rather than transcriptions. The counts describe available choices, not required musical activity.
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+`grouping_for` is a pure source-only decision. It honors written 3+2 or 2+3, otherwise compares actual chord changes at the secondary boundary, then melody entrances following at least an eighth-note rest, then other melody attacks; equal evidence defaults to 3+2. An unchanged chord marking is not a change. The selection stays fixed through a continuous meter section, and each role derives it independently from the same source. Fills cannot borrow another grouping. No accents or playback swing changes are inferred. `groove_cycles` additionally reports grouping, its evidence and the eligible pattern count. Equal-duration compound meters (such as 6/8) do not borrow the 3/4 vocabulary; unsupported comping meters fail explicitly.
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+Accompaniment dependency keys and choice streams include only full-pattern meters and partial lengths present in that source, plus the applicable instrument policy. Adding unused-meter patterns therefore does not reseed an existing song; unrelated role policies remain excluded. Research prose is excluded from musical seeds. This schema migration changes the accompaniment choice-key domain once; it does not promise identical previous 4/4 tie-break winners. Source melodies, registered solos, notation format and playback count-in are unchanged.
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+The cycle begins at the first full source-body measure. A partial-form entry first fits the incoming harmony, then slices the sounded figure instead of restarting it; this prevents a previously clipped chord hold from reappearing as a new attack. An odd final bar uses the appropriate half-pattern. Meter changes restart a compatible cycle. Unsupported durations fail explicitly, and limited vocabularies report a shorter cycle. Optional final-harmony changes rebind the same selected pattern. Canonical grips are fixed wherever the chord and interval start remain unchanged, so a new turnaround cannot move neighboring unaffected voicings.
 
 Fills replace only a two-bar figure's ending bar, using a same-family variation that improves the existing source-fit objective. Eligible boundaries are source section endings, form endings, or a melody breath of at least one quarter-note beat at the block end. Carried events from the opening bar are protected. The largest improvements are retained with an eight-measure minimum separation around the whole cyclic form, equally for both roles; no fill quota applies. Fills do not change cycle phase and recur at identical source positions. Reports record the base slot, selected fill, source index and reason.