Apply RFC-compliant ast-parser and exporter

- ast-parser: railsbackCurve moved to variation level, FM shape child
  parsing, buildLabelSpec direct A/S/R handling, bar IDs as opaque strings
- exporter: RFC-compact shape format, correct instrument NAME: key,
  patchScore regex fixed, RAILSBACK_CURVE emitted from variationLines
- .gitignore: exclude test-parser.mjs pending author confirmation

static/ast-parser.js

@@ -178,7 +178,6 @@ function buildInstrument(node) {
         isDirty: false,
         variations: [],
         basicProperties: null,
-        railsbackCurve: null,
         volumes: null,
         timbre: null,
         fmModulations: [],
@@ -193,9 +192,6 @@ function buildInstrument(node) {
             case 'character.basic_properties':
                 instr.basicProperties = buildBasicProperties(child);
                 break;
-            case 'RAILSBACK_CURVE.shape':
-                instr.railsbackCurve = buildShape(child);
-                break;
             case 'VOLUMES.shape':
                 instr.volumes = buildShape(child);
                 break;
@@ -221,6 +217,7 @@ function buildVariation(node) {
         labelSpecs: [],
         subvariations: [],
         spread: null,
+        railsbackCurve: null,
         rawChildren: [],
     };
 
@@ -239,6 +236,9 @@ function buildVariation(node) {
             case 'variation.SPREAD':
                 v.spread = child.positionals;
                 break;
+            case 'RAILSBACK_CURVE.shape':
+                v.railsbackCurve = buildShape(child);
+                break;
             default:
                 v.rawChildren.push(buildGeneric(child));
         }
@@ -267,7 +267,10 @@ function buildBasicProperties(node) {
         } else if (child.parentSlot === 'variation' && child.slot === 'O') {
             bp.oscillator = child.props.ref ?? child.positionals[0];
         } else if (child.parentSlot === 'FM' && child.slot === 'modulation') {
-            bp.fmModulations.push({ ...child.props });
+            const fm = { ...child.props };
+            const envChild = child.children.find(c => c.slot === 'shape');
+            if (envChild) fm.shape = buildShape(envChild);
+            bp.fmModulations.push(fm);
         } else {
             bp.rawChildren.push(buildGeneric(child));
         }
@@ -284,13 +287,23 @@ function buildLabelSpec(node) {
         rawChildren: [],
     };
 
+    const directBpChildren = [];
     for (const child of node.children) {
         if (child.parentSlot === 'variation' && child.slot === 'basic_properties') {
             ls.basicProperties = buildBasicProperties(child);
+        } else if (
+            (child.slot === 'shape' && (child.parentSlot === 'A' || child.parentSlot === 'S' || child.parentSlot === 'R')) ||
+            (child.parentSlot === 'variation' && child.slot === 'O') ||
+            (child.parentSlot === 'FM' && child.slot === 'modulation')
+        ) {
+            directBpChildren.push(child);
         } else {
             ls.rawChildren.push(buildGeneric(child));
         }
     }
+    if (!ls.basicProperties && directBpChildren.length > 0) {
+        ls.basicProperties = buildBasicProperties({ children: directBpChildren });
+    }
 
     return ls;
 }
@@ -300,7 +313,6 @@ function buildShape(node) {
         type: 'shape',
         length: node.props.length,
         start: node.props.start,
-        z: node.props.z ?? 1,
         coords: node.children
             .filter(c => c.slot === 'coords')
             .map(c => ({
@@ -313,15 +325,9 @@ function buildShape(node) {
 }
 
 function buildBar(node) {
-    const id = node.positionals[0] ?? '';
-    const idMatch = id.match(/^(\w?)(\d+)P(\d+)L(\d+)M(\d+)$/);
     const bar = {
         type: 'bar',
-        id,
-        movement: idMatch ? idMatch[1] : '',
-        part: idMatch ? parseInt(idMatch[2]) : 0,
-        line: idMatch ? parseInt(idMatch[3]) : 0,
-        measure: idMatch ? parseInt(idMatch[4]) : 0,
+        id: node.positionals[0] ?? '',
         stressor: null,
         tempoShape: null,
         tempoLevels: null,