refactor(state-machine): support multiple lifecycles per blueprint

Blueprint.stateMachine becomes stateMachines[], the viewer renders each
machine in its own panel, and StateMachine draws self-loops (a === b) for
recurring transitions that don't change state. Existing blueprints move
to the array form unchanged.

src/components/BlueprintViewer.vue

@@ -164,15 +164,22 @@ const funcCount = computed(() => props.blueprint.functions.length)
       </div>
     </template>
 
-    <!-- COMPANION 2: state machine -->
-    <template v-if="blueprint.stateMachine">
-      <h2 class="section">Lifecycle — state machine</h2>
-      <div class="panel">
+    <!-- COMPANION 2: state machine(s) -->
+    <template v-if="blueprint.stateMachines?.length">
+      <h2 class="section">
+        Lifecycle — state machine{{ blueprint.stateMachines.length > 1 ? "s" : "" }}
+      </h2>
+      <div
+        v-for="(m, i) in blueprint.stateMachines"
+        :key="i"
+        class="panel"
+        :class="{ stacked: i > 0 }"
+      >
         <div class="cap">
-          <span>{{ blueprint.stateMachine?.caption ?? "Composed lifecycle" }}</span
-          ><span class="id">{{ blueprint.stateMachine?.field ?? "loadState : LoadState" }}</span>
+          <span>{{ m.caption ?? "Composed lifecycle" }}</span
+          ><span class="id">{{ m.field ?? "loadState : LoadState" }}</span>
         </div>
-        <div class="body svg-wrap"><StateMachine :machine="blueprint.stateMachine" /></div>
+        <div class="body svg-wrap"><StateMachine :machine="m" /></div>
       </div>
     </template>
 
@@ -398,6 +405,10 @@ code {
 .svg-wrap {
   overflow-x: auto;
 }
+/* stacked state-machine panels (a blueprint with more than one lifecycle) */
+.panel.stacked {
+  margin-top: 14px;
+}
 
 /* full-view readout */
 .rblock {

src/components/StateMachine.vue

@@ -46,6 +46,26 @@ const edges = computed(() =>
   props.machine.edges.map((e) => {
     const a = byId.value[e.from]
     const b = byId.value[e.to]
+    // Self-loop (a === b): a small arc off the top edge of the node, arrowhead
+    // curling back in. Used by the recurring transitions that don't change state
+    // — BLE's discover(p) on Scanning and read/write/subscribe on Ready.
+    if (a === b) {
+      const cx = a.x + a.w / 2
+      const top = a.y
+      const r = Math.min(a.w / 3.2, 20)
+      const h = 30
+      const sx = cx - r
+      const tx = cx + r
+      return {
+        key: `${e.from}-${e.to}-${e.label}`,
+        d: `M${sx} ${top} C ${sx} ${top - h} ${tx} ${top - h} ${tx} ${top}`,
+        color: SM_COLORS[e.kind],
+        marker: `url(#ar-${e.kind})`,
+        label: e.label,
+        lx: cx,
+        ly: top - h - 3,
+      }
+    }
     const [acx, acy] = center(a)
     const [bcx, bcy] = center(b)
     const [sx, sy] = edgePoint(a, bcx, bcy)

src/data/blueprint.ts

@@ -144,6 +144,9 @@ export interface Blueprint {
   functions: BlueprintFunction[]
   coreInvariants: string[]
   composition?: Composition
-  stateMachine?: StateMachine
+  // Zero or more lifecycles. Most blueprints have one (or reuse LOADSTATE_MACHINE);
+  // some — like BLE, which is a central with an adapter/scan lifecycle *and* a
+  // per-peripheral link lifecycle — render several, each in its own panel.
+  stateMachines?: StateMachine[]
   related?: RelatedRef[]
 }

src/data/calendarBlueprint.ts

@@ -204,5 +204,5 @@ export const calendar: Blueprint = {
     ],
   },
 
-  stateMachine: CALENDAR_MACHINE,
+  stateMachines: [CALENDAR_MACHINE],
 }

src/data/gridBlueprint.ts

@@ -202,5 +202,5 @@ export const grid: Blueprint = {
     ],
   },
 
-  stateMachine: LOADSTATE_MACHINE,
+  stateMachines: [LOADSTATE_MACHINE],
 }

src/data/listBlueprint.ts

@@ -226,5 +226,5 @@ export const list: Blueprint = {
     ],
   },
 
-  stateMachine: LOADSTATE_MACHINE,
+  stateMachines: [LOADSTATE_MACHINE],
 }

src/data/passwordAuthBlueprint.ts

@@ -333,7 +333,7 @@ export const passwordAuth: Blueprint = {
     ],
   },
 
-  stateMachine: PASSWORD_AUTH_MACHINE,
+  stateMachines: [PASSWORD_AUTH_MACHINE],
 
   related: [
     { name: "Form", relation: "extends · base" },

src/data/rememberMeBlueprint.ts

@@ -301,7 +301,7 @@ export const rememberMe: Blueprint = {
     ],
   },
 
-  stateMachine: REMEMBER_ME_MACHINE,
+  stateMachines: [REMEMBER_ME_MACHINE],
 
   related: [
     { name: "PasswordAuth", relation: "host · requires" },