feat(sdk): add developer project tooling

docs(rfc): propose SDK developer project tooling

feat: rename / docs

ci: fix windows gates

docs: revert

packages/sdk/scripts/src/templates/assets/config-install-failure.txt.tpl

@@ -0,0 +1,2 @@
+Changes were committed, but install failed: {{error}}
+Retry: {{packageManager}} {{installArgs}}

packages/sdk/scripts/src/templates/assets/usage.txt.tpl

@@ -0,0 +1,7 @@
+Usage: dsh <command> [options]
+
+Commands:
+  start [target] [-- args...]  Import a built module, or boot cordis.yml
+  dev [target] [-- args...]    Start with TypeScript and local-plugin source resolution
+  build [args...] Run the project's installed tsdown
+  config          Interactively edit project features

packages/sdk/scripts/src/templates/dsh-templates.ts

@@ -0,0 +1,21 @@
+/**
+ * Package-owned terminal templates for the dsh launcher.
+ *
+ * @module @deepseek-ai/dsh-scripts/templates/dsh-templates
+ */
+
+import { TextTemplate, type PackageManagerName } from '@deepseek-ai/dsh-helper'
+
+interface ConfigInstallFailureTemplateModel {
+  error: string
+  packageManager: PackageManagerName
+  installArgs: string
+}
+
+/** Compiled dsh terminal templates. */
+export const DSH_TEMPLATES = {
+  usage: TextTemplate.fromFile<Record<string, never>>(new URL('./assets/usage.txt.tpl', import.meta.url)),
+  configInstallFailure: TextTemplate.fromFile<ConfigInstallFailureTemplateModel>(
+    new URL('./assets/config-install-failure.txt.tpl', import.meta.url),
+  ),
+} as const