feat(sdk): add developer project tooling

docs(rfc): propose SDK developer project tooling

feat: rename / docs

ci: fix windows gates

docs: revert

packages/sdk/helper/src/ids.ts

@@ -0,0 +1,31 @@
+/**
+ * Branded identities owned by the SDK project domain.
+ *
+ * @module @deepseek-ai/dsh-helper/ids
+ */
+
+import type { Branded } from '@deepseek-ai/dsh-brand'
+
+/** Stable identity of a builtin SDK feature. */
+export type FeatureId = Branded<'FeatureId'>
+
+/**
+ * Construct a feature identity from its registry key.
+ * @param value - lowercase kebab-case registry key.
+ * @returns branded feature identity.
+ */
+export function featureId(value: string): FeatureId {
+  if (!/^[a-z][a-z0-9-]*$/.test(value)) {
+    throw new Error(`invalid feature id: ${JSON.stringify(value)}`)
+  }
+  return value as FeatureId
+}
+
+/** Stable identity of a resource contributed to an SDK project. */
+export type ResourceKey = Branded<'ResourceKey'>
+
+/** Construct a resource key from its owner-qualified value. */
+export function resourceKey(value: string): ResourceKey {
+  if (value.length === 0) throw new Error('resource key must not be empty')
+  return value as ResourceKey
+}