fix(match): index collapsed loop forms — real 12-bar blues now matches its KB entry (task L-60, 1/2)

buildLoopIndex additionally indexes each progression's collapsed form
(adjacent (degree,suffix) dedup + wrap), appended after raw entries so
every prior matcher winner is preserved except the enumerated
country-145 self-attribution. Repairs a pre-existing LIVE-detection
bug: a real 12-bar or 8-bar blues stream collapses to fewer names than
the raw KB degrees, so it matched NOTHING and the Jam Guide sat empty.
JamGuide reads authored plays through the collapsed station's
sourceIndex (all four guitar/piano/bass paths). Adds seedableLoop +
the round-trip roulette pool (smoke sweep: 4 failures / pool 52).
theory.js canonicalize exported. Critic PASS (fix-(a) additivity
proven registry-wide; pool reproduced from the spec; bass sourceIndex
station 5 -> raw 10 hand-checked).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/components/JamGuide.jsx

@@ -281,6 +281,10 @@ export default function JamGuide({ detectedProgression, keyInfo, chordHistory =
         quality: qualities[i] ?? 'maj',
         label: `${noteName}${suffix}`,
         rn: prog?.rn?.[i] ?? '',
+        // Fix (a) remap (jam-roulette.md §3.3.2): the RAW authored-play index this
+        // (possibly collapsed) station reads from. Raw matches have no sourceIndex
+        // → identity (i); collapsed matches carry the projection's map.
+        sourceIndex: prog?.sourceIndex?.[i] ?? i,
       }
     })
     if (instrument === 'guitar') {
@@ -288,7 +292,7 @@ export default function JamGuide({ detectedProgression, keyInfo, chordHistory =
       const play = Array.isArray(plays) ? plays[0] : null
       const chords = play?.chords ?? []
       for (let i = 0; i < stations.length; i++) {
-        stations[i].shape = chords[i]?.shape ?? null
+        stations[i].shape = chords[stations[i].sourceIndex ?? i]?.shape ?? null
       }
     } else if (instrument === 'piano') {
       // Authored piano pack first (L-24): the matched style's first piano play
@@ -296,7 +300,7 @@ export default function JamGuide({ detectedProgression, keyInfo, chordHistory =
       const pianoPlays = kb[match.style]?.instruments?.piano?.plays?.[prog?.id]
       const play = Array.isArray(pianoPlays) && pianoPlays.length ? pianoPlays[0] : null
       const authored = play
-        ? stations.map((st, i) => recipeVoicing(play.chords?.[i]?.recipe, st.rootPc, st.quality))
+        ? stations.map((st, i) => recipeVoicing(play.chords?.[st.sourceIndex ?? i]?.recipe, st.rootPc, st.quality))
         : null
       // Computed fallback — only built when needed (no pack, or a recipe that
       // failed to resolve). Identical to the pre-L-24 computed path.
@@ -408,7 +412,7 @@ export default function JamGuide({ detectedProgression, keyInfo, chordHistory =
             ? `Heard ${detectedProgression.join(' → ')} — no ${activeStyle} pattern matched yet; following the chord as it commits.`
             : 'No repeating loop yet — following the chord as it commits.'}
         </p>
-        <VoicingBrowser rootPc={liveChord.rootPc} quality={liveChord.type} show={instrument} />
+        <VoicingBrowser rootPc={liveChord.rootPc} quality={liveChord.type} show={instrument} dense />
       </section>
     )
   ) : (
@@ -582,10 +586,10 @@ function BassGuideRows({ stations = [], activeIndex = -1, keyMode, live = false,
                       rootPc={st.rootPc}
                       quality={st.quality}
                       nextRootPc={stations[(i + 1) % n].rootPc}
-                      pattern={play?.chords?.[i]?.pattern}
+                      pattern={play?.chords?.[st.sourceIndex ?? i]?.pattern}
                       playLabel={play?.label}
                       feel={play?.feel}
-                      note={play?.chords?.[i]?.note}
+                      note={play?.chords?.[st.sourceIndex ?? i]?.note}
                       chordLabel={st.label}
                     />
                   ))}