refactor(packages): dissolve ui/ and rename sdk/ to scaffold/

git mv per the regrouping RFC: the five human-collaboration seams and
tui join packages/interaction/, app-boot becomes packages/boot/, and
jsonrpc joins the renamed scaffold/ (formerly sdk/) as its server half
beside client/protocol/create-sdk/helper/scripts/telemetry, whose
folders drop the legacy sdk- prefix. Three new group README triplets
replace the ui/ and sdk/ ones; tsconfig references/paths/globs,
knip keys, vitest globs, gate scripts, catalogs, docs, and the
lockfile follow. Adds the four settled FIXME rename markers
(dsh-sdk-server, dsh-sdk-telemetry, dsh-sdk-helper, dsh-sdk-scripts).

The scaffold folders diverge from their npm names until those renames
land, so tsconfig.base.json maps the three affected names explicitly
beside the group wildcard. Also repairs two pre-existing stale-path
classes the strengthened sweep surfaced: docs/web-styling.md's retired
web-ui host package and type-model spec fixture-literal joins.

app-boot's three Loader-composition specs time out at the default 5s
under full-suite parallel load on this filesystem (pre-existing;
pass isolated with --testTimeout=30000); interaction/scaffold/boot
suites otherwise green (687 passed).

packages/scaffold/scripts/src/config.ts

@@ -0,0 +1,37 @@
+/**
+ * dsh-sdk config command composition.
+ *
+ * @module @deepseek-ai/dsh-scripts/config
+ */
+
+import {
+  ClackPromptPort,
+  SdkProject,
+  createBuiltinRegistry,
+  type PromptPort,
+} from '@deepseek-ai/dsh-helper'
+import { ConfigWorkflow, type ConfigWorkflowResult } from './config/config-workflow.ts'
+
+/** Process stream slice required by dsh-sdk config. */
+export interface ConfigCommandContext {
+  cwd: string
+  stdin: NodeJS.ReadStream
+  stdout: NodeJS.WriteStream
+  port?: PromptPort
+  install?: (project: SdkProject) => Promise<void>
+}
+
+/** Open and interactively edit one existing SDK project. */
+export async function runConfigCommand(context: ConfigCommandContext): Promise<ConfigWorkflowResult> {
+  if (!context.port && (!context.stdin.isTTY || !context.stdout.isTTY)) {
+    throw new Error('dsh-sdk config requires an interactive TTY')
+  }
+  const project = await SdkProject.open(context.cwd)
+  const registry = createBuiltinRegistry(project.profile)
+  return new ConfigWorkflow(
+    /* v8 ignore next -- production TTY wiring is exercised by the built-bin smoke */
+    context.port ?? new ClackPromptPort(context.stdin, context.stdout),
+    context.stdout,
+    context.install,
+  ).run(project, registry)
+}