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/client/src/index.ts

@@ -0,0 +1,29 @@
+/**
+ * TypeScript client SDK for the DeepSeek Harness runtime: spawn the
+ * `dsh-jsonrpc-agent` runtime as a subprocess and drive agent turns over
+ * stdio JSON-RPC. `DeepSeekHarness` is the high-level run API;
+ * `HarnessClient` is the lower-level protocol client. A pure library — it
+ * registers nothing on a Cordis context; the runtime process it spawns is a
+ * complete harness configured by its own `cordis.yml`.
+ *
+ * @module @deepseek-ai/dsh-sdk-client
+ */
+
+export { DeepSeekHarness, HarnessSession } from './api.ts'
+export type { RunOptions } from './api.ts'
+export {
+  HarnessClient,
+  RequestTimeoutError,
+  SdkProtocolError,
+  TransportClosedError,
+} from './client.ts'
+export type { NotificationSubscription } from './client.ts'
+export { JsonRpcResponseError } from '@deepseek-ai/dsh-sdk-protocol'
+export type {
+  ContentBlock,
+  DeepSeekHarnessOptions,
+  HarnessClientOptions,
+  HarnessNotification,
+  NotificationFilter,
+  RunResult,
+} from './types.ts'