fix: declare cmake-rn dependency in weak-node-api

weak-node-api's `prebuild:build` script invokes the `cmake-rn` CLI, but the
package never declared cmake-rn. Under npm's hoisting every workspace bin was
linked into the root node_modules/.bin, so `cmake-rn` was always on PATH.
pnpm only links a package's *declared* dependencies' bins, so on CI the
bootstrap failed with `cmake-rn: not found` (a phantom bin dependency that
only surfaces when the native prebuild runs).

Declare `cmake-rn` as a devDependency (workspace:*) so pnpm links its bin into
weak-node-api/node_modules/.bin. This introduces a benign dev-time cycle
(cmake-rn imports weak-node-api's JS for prebuild paths; weak-node-api's build
uses the cmake-rn CLI) which pnpm reports as a warning and handles fine; the
topological bootstrap still sequences weak-node-api before its consumers.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01DnwodAoNbqPec77191HVXn

Author: claude

packages/weak-node-api/package.json

@@ -68,6 +68,7 @@
     "node-api-headers": "^1.5.0"
   },
   "devDependencies": {
+    "cmake-rn": "workspace:*",
     "zod": "^4.1.11"
   }
 }