feat: adapt to DSH 0.1.2-alpha.2 (npm-published) and bump to v0.17.2

DSH 0.1.2-alpha.2 is on npm under the `alpha` dist-tag, so the CI mount
pin and the @deepseek-ai/* devDependencies baseline move up from
0.1.1-rc.1/rc.2 (the dead dsh-client-runtime devDep goes away with
them). Verified end-to-end against a real 0.1.2-alpha.2 host: full
vitest suite (1106), typecheck, build/pack, consumer type surface, and
the headless mount smoke 14/14 — the token URL, slash RPC and
MarkdownText labels contracts are unchanged from alpha.1.

- dsh-settings dropped the runtime `settingsNamespace` export:
  namespaces are validated at compile time (SettingsNamespaceInput), so
  the host passes the 'dsh-better-sidebar' constant directly and the
  fake settings service in smoke.spec casts to the branded type.
- dsh-subagent bumped SUBAGENT_DESCRIPTOR_VERSION 2 -> 3: the version is
  stamped by the host package; the sidechat seed assertion now follows
  the constant instead of pinning a literal.
- Restored SessionEvent.ignorable and the RemoteError wrapping were
  verified to have no impact on this plugin.
- e2e scratch profiles (e2e-mount.sh / e2e-aggregate-mount.sh) add
  '@deepseek-ai/*' to minimumReleaseAgeExclude (mirroring the repo
  root): alpha releases are often <24h old when the lane runs, which
  pnpm 11's default minimumReleaseAge would refuse to install.
- vitest excludes .worktrees/** — local task worktrees carried stale
  code against the shared node_modules and broke on the devDeps bump.
- Version lockstep 0.17.2 (package.json, dsh.plugin.json,
  SIDEBAR_SERVICE_VERSION, README/AGENTS/guide docs).

tests/sidechat-routes.spec.ts

@@ -8,6 +8,7 @@
  * afterSeq deltas, tail cap, live/persisted sources).
  */
 import { describe, expect, it, vi } from 'vitest'
+import { SUBAGENT_DESCRIPTOR_VERSION } from '@deepseek-ai/dsh-subagent'
 import { buildSidechatApi } from '../src/sidechat-routes.ts'
 import { SidebarError } from '../src/wire.ts'
 import { SIDE_BOUNDARY_PROMPT, SIDE_INJECTION_PLUGIN, SIDE_NEW_THREAD_TITLE, sideLabel } from '../src/sidechat-core.ts'
@@ -134,7 +135,10 @@ describe('sidechat.start', () => {
       'subagent/descriptor',
     ])
     expect(options.seed.at(-1)?.data).toMatchObject({
-      version: 2,
+      // The descriptor version is stamped by the host package's
+      // snapshotSubagentDescriptor — follow it instead of pinning a literal
+      // (bumped 2 → 3 in DSH 0.1.2-alpha.2).
+      version: SUBAGENT_DESCRIPTOR_VERSION,
       mode: 'continuable',
       provider: 'sidechat',
       label: sideLabel('explain the event flow'),

tests/smoke.spec.ts

@@ -8,7 +8,7 @@ import { spawnSync } from 'node:child_process'
 import { mkdirSync, mkdtempSync, readFileSync, rmSync, symlinkSync, writeFileSync } from 'node:fs'
 import { tmpdir } from 'node:os'
 import { join, resolve as resolvePath } from 'node:path'
-import { SettingsConflictError, settingsNamespace } from '@deepseek-ai/dsh-settings'
+import { SettingsConflictError, type SettingsNamespace } from '@deepseek-ai/dsh-settings'
 import { apply, mediaTypeForPath } from '../src/index.ts'
 import { encodeHtmlUrl } from '../src/html-route.ts'
 import * as git from '../src/git.ts'
@@ -844,7 +844,7 @@ describe('side card settings routes', () => {
         const entry = namespaces.get(ns)
         if (entry === undefined) throw new Error(`settings namespace "${ns}" is not registered`)
         if (expectedRevision !== undefined && expectedRevision !== entry.revision) {
-          throw new SettingsConflictError(settingsNamespace(ns), expectedRevision, entry.revision)
+          throw new SettingsConflictError(ns as SettingsNamespace, expectedRevision, entry.revision)
         }
         entry.value = { ...entry.value, ...patch }
         entry.revision += 1