Add TOML versions of formulas (gt-xmyha)

Converted all .formula.json files to .formula.toml using bd formula convert.
TOML provides better ergonomics:
- Multi-line strings without \n escaping
- Human-readable diffs
- Comments allowed

Original JSON files retained for backwards compatibility.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

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

@@ -0,0 +1,11 @@
+description = "Enterprise-grade engineering workflow. Shiny + Rule of Five expansion on implement step."
+extends = ["shiny"]
+formula = "shiny-enterprise"
+type = "workflow"
+version = 1
+
+[compose]
+
+[[compose.expand]]
+target = "implement"
+with = "rule-of-five"