chore: add coding conventions from nerve

- CLAUDE.md: functional-first, type over interface, no optional props, Result type
- biome.json: lint + format config (Biome 1.9)
- tsconfig.json: strict mode, composite project references
- .cursor/rules: global conventions + no-dynamic-import

Adapted from uncaged/nerve for bun workspace.

小橘 <xiaoju@shazhou.work>

tsconfig.json

@@ -0,0 +1,22 @@
+{
+  "compilerOptions": {
+    "target": "ES2022",
+    "lib": ["ES2022"],
+    "module": "NodeNext",
+    "moduleResolution": "NodeNext",
+    "strict": true,
+    "exactOptionalPropertyTypes": true,
+    "esModuleInterop": true,
+    "skipLibCheck": true,
+    "forceConsistentCasingInFileNames": true,
+    "declaration": true,
+    "declarationMap": true,
+    "sourceMap": true,
+    "composite": true,
+    "outDir": "dist"
+  },
+  "references": [
+    { "path": "packages/workflow" },
+    { "path": "packages/cli-workflow" }
+  ]
+}