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).

.agents/notes/proposed/simplification/2026-07-19-make-jsonrpc-directional.md

@@ -20,11 +20,11 @@ Return the settled outcome directly from `session/prompt` as `{ status, reason }
 
 ## Implementation plan
 
-1. In `packages/ui/jsonrpc/src/server.ts`, replace `SessionPromptResult.accepted` with `status: 'ok' | 'error' | 'aborted'` and the captured `TurnEndReason`. `HarnessSdkServer.prompt()` will return `completed` as `ok`, `aborted` as `aborted`, and every other current or merge-extensible reason as `error`; reaching idle without a `turn/end` remains an invariant error. Remove only `session.finished`, leaving `session.event`, `subagent.started`, and `subagent.finished` unchanged.
-2. In `packages/sdk/sdk-protocol/src/transport.ts`, narrow the shared class to the directions with consumers — inbound requests/outbound responses (the server) and outbound requests/inbound responses plus inbound notifications (the TypeScript SDK client) — removing only server-originated `request()` use and client-originated notification dispatch, or split the class into a server-side and client-side transport. Request result, method-not-found, and handler-error responses retain their current behavior and remain ordered after notifications emitted by the awaited handler.
+1. In `packages/scaffold/server/src/server.ts`, replace `SessionPromptResult.accepted` with `status: 'ok' | 'error' | 'aborted'` and the captured `TurnEndReason`. `HarnessSdkServer.prompt()` will return `completed` as `ok`, `aborted` as `aborted`, and every other current or merge-extensible reason as `error`; reaching idle without a `turn/end` remains an invariant error. Remove only `session.finished`, leaving `session.event`, `subagent.started`, and `subagent.finished` unchanged.
+2. In `packages/scaffold/protocol/src/transport.ts`, narrow the shared class to the directions with consumers — inbound requests/outbound responses (the server) and outbound requests/inbound responses plus inbound notifications (the TypeScript SDK client) — removing only server-originated `request()` use and client-originated notification dispatch, or split the class into a server-side and client-side transport. Request result, method-not-found, and handler-error responses retain their current behavior and remain ordered after notifications emitted by the awaited handler.
 3. In `python/sdk/src/deepseek_harness/client.py`, `models.py`, and `__init__.py`, remove `IncomingRequest`, `_requests`, `notify()`, `next_request()`, `respond()`, and `respond_error()`. Add a public validated `SessionPromptResponse` carrying status and reason, return it from `session_prompt()`, and keep an explicit reader guard that ignores unexpected server-request frames instead of allowing them to match a response waiter.
 4. In `python/sdk/src/deepseek_harness/api.py`, build `TurnResult.status` and a new `TurnResult.reason` from `SessionPromptResponse`, then delete the `session.finished` branch and second completion loop. Keep the subscription open during the request and preserve `_request_raw()`'s final notification drain so the last `turn/end` event and any subagent notification written before the response are collected before `Session.run()` reconstructs the final assistant message.
-5. Replace the symmetric transport-pair cases in `packages/sdk/sdk-protocol/tests/transport.spec.ts` with per-direction coverage, and update `server.spec.ts`, `plugin-apply.spec.ts`, and `built-scope-carrier.e2e.ts` for direct outcomes, ordering, overlap, shutdown, and the narrowed fake; update the TypeScript SDK client (`packages/sdk/sdk-client`) and its suites for response-based settlement. Update `python/sdk/tests/test_client.py` for response-based settlement, unexpected-request-frame handling, callback and concurrency behavior, and the removed public helpers. Update the JSON-RPC and bilingual Python SDK READMEs, export JSDoc and declarations, `scripts/smoke-python-runtime.py`, and the Python single-executable snapshot.
+5. Replace the symmetric transport-pair cases in `packages/scaffold/protocol/tests/transport.spec.ts` with per-direction coverage, and update `server.spec.ts`, `plugin-apply.spec.ts`, and `built-scope-carrier.e2e.ts` for direct outcomes, ordering, overlap, shutdown, and the narrowed fake; update the TypeScript SDK client (`packages/scaffold/client`) and its suites for response-based settlement. Update `python/sdk/tests/test_client.py` for response-based settlement, unexpected-request-frame handling, callback and concurrency behavior, and the removed public helpers. Update the JSON-RPC and bilingual Python SDK READMEs, export JSDoc and declarations, `scripts/smoke-python-runtime.py`, and the Python single-executable snapshot.
 
 ## Alternatives considered