refactor(model): name Feature status by domain, not RAG color

StatusLevel held green/orange/red — the RAG vocabulary CONTEXT.md
explicitly lists under _Avoid_ for the Status term, leaking a
presentation concern into the model and authored TOML. Replace with
on-track/at-risk/off-track; color now lives only in the renderer's
tone() mapping. Breaking change to authored .toml status values.

src/components/MacroplanGrid.vue

@@ -58,20 +58,14 @@ const gridStyle = computed(() => ({
 
 function tone(row: FeatureRow): Tone {
   if (row.delivered) return row.onTime ? 'success' : 'error'
-  if (row.status === 'green') return 'success'
-  if (row.status === 'orange') return 'warning'
-  if (row.status === 'red') return 'error'
+  if (row.status === 'on-track') return 'success'
+  if (row.status === 'at-risk') return 'warning'
+  if (row.status === 'off-track') return 'error'
   return 'neutral'
 }
 
 function statusWord(row: FeatureRow): string {
-  return row.status === 'green'
-    ? 'on track'
-    : row.status === 'orange'
-      ? 'at risk'
-      : row.status === 'red'
-        ? 'blocked'
-        : 'in flight'
+  return row.status ? row.status.replace('-', ' ') : 'in flight'
 }
 
 function markerAt(row: FeatureRow, w: WeekId): MarkerKind | null {