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/lib/theory.js

@@ -576,7 +576,9 @@ function matchLoopOccurrence(win, start, cand) {
 
 // Returns the lexicographically smallest rotation so the same loop always
 // produces the same string regardless of where in the cycle we currently are.
-function canonicalize(pattern) {
+// Exported additively for match.js's seedableLoop / round-trip pool (task L-60,
+// jam-roulette.md §3.2) — the seed must canonicalize identically to detection.
+export function canonicalize(pattern) {
   let best = pattern
   for (let i = 1; i < pattern.length; i++) {
     const rot = [...pattern.slice(i), ...pattern.slice(0, i)]