refactor: formulas use JSON instead of YAML (gt-8tmz)

JSON for consistency with beads (issues.jsonl, molecules.jsonl).
Agents create/manage formulas; humans use visualizers.

- Simpler parsing (Go built-in JSON)
- No YAML gotchas
- Agents generate JSON flawlessly

.beads/formulas/shiny-enterprise.formula.json

@@ -0,0 +1,53 @@
+{
+  "formula": "shiny-enterprise",
+  "extends": "shiny",
+  "description": "Enterprise-grade engineering workflow. Shiny + Rule of Five + Security + Performance Testing + Review Loop.",
+  "version": 1,
+  "compose": [
+    {
+      "expand": {
+        "target": "implement",
+        "with": "rule-of-five"
+      }
+    },
+    {
+      "aspect": {
+        "pointcut": "implement.*",
+        "with": "security-audit"
+      }
+    },
+    {
+      "gate": {
+        "before": "submit",
+        "condition": "security-postscan.approved == true",
+        "message": "Cannot submit without security approval"
+      }
+    },
+    {
+      "branch": {
+        "from": "implement.refine-4",
+        "steps": [
+          {"id": "perf-test", "description": "Run performance benchmarks"},
+          {"id": "load-test", "description": "Run load/stress tests"},
+          {"id": "chaos-test", "description": "Run chaos engineering tests"}
+        ],
+        "join": "review"
+      }
+    },
+    {
+      "loop": {
+        "step": "review",
+        "until": "review.output.approved == true",
+        "max": 3,
+        "on-max": "escalate"
+      }
+    },
+    {
+      "advice": {
+        "target": "*",
+        "before": {"id": "log-start", "description": "Log: Starting {step.id}"},
+        "after": {"id": "log-end", "description": "Log: Completed {step.id}"}
+      }
+    }
+  ]
+}