chore: scaffold Bun workspace monorepo

Sets up the initial project structure: two packages (@kitchen-md/core
and @kitchen-md/bin), shared tsconfig, shared fixtures, per-package
test stubs (unit, integration, smoke), .gitignore, and project
CLAUDE.md with Conventional Commits convention.

bun.lock

@@ -0,0 +1,37 @@
+{
+  "lockfileVersion": 1,
+  "configVersion": 1,
+  "workspaces": {
+    "": {
+      "name": "kitchen-md",
+      "devDependencies": {
+        "bun-types": "latest",
+      },
+    },
+    "packages/bin": {
+      "name": "@kitchen-md/bin",
+      "version": "0.0.0",
+      "bin": {
+        "kitchen": "./src/index.ts",
+      },
+      "dependencies": {
+        "@kitchen-md/core": "workspace:*",
+      },
+    },
+    "packages/core": {
+      "name": "@kitchen-md/core",
+      "version": "0.0.0",
+    },
+  },
+  "packages": {
+    "@kitchen-md/bin": ["@kitchen-md/bin@workspace:packages/bin"],
+
+    "@kitchen-md/core": ["@kitchen-md/core@workspace:packages/core"],
+
+    "@types/node": ["@types/node@26.1.1", "", { "dependencies": { "undici-types": "~8.3.0" } }, "sha512-nxAkRSVkN1Y0JC1W8ky/fTfkGsMmcrRsbx+3XoZE+rMOX71kLYTV7fLXpqud1GpbpP5TuffXFqfX7fH2GgZREw=="],
+
+    "bun-types": ["bun-types@1.3.14", "", { "dependencies": { "@types/node": "*" } }, "sha512-4N0ig0fEomHt5R0KCFWjovxow98rIoRwKolrYdCcknNwMekCXRnWEUvgu5soYV8QXtVsrUD8B95MBOZGPvr6KQ=="],
+
+    "undici-types": ["undici-types@8.3.0", "", {}, "sha512-j375ScV60dom+YkPFIfTLcOiPxkN/buHz5GobjLhixFuANaNs3C9l4GmrWqejgXWJ7BbJcFYpTEUkS1Ge8bpZQ=="],
+  }
+}