chore(sync): re-base the fork onto upstream dsh-better-sidebar v0.19.1

The fork was pinned at upstream v0.18.0. That is the entire reason the window
ran TWO sidebars and TWO near-identical panel toggles: DSH 2.0.10 ships its own
right sidebar (@deepseek-ai/dsh-client-ui-sidebar-right), and upstream only
adopted it in v0.19.0-alpha.1 — which arrived after our fork point. v0.19.1 is
also the one upstream line whose support range actually matches our host
(engines.dsh >=0.1.5-rc.1, 14 DSH peers ^0.1.5-rc.1, host = 0.1.5-rc.2), so it
is the only tag the host's startup precheck accepts.

What upstream v0.18.0 → v0.19.1 brings
- src/client/native/{index,surface,tab-adapter}.tsx: every tab the plugin can
  draw becomes an OFFICIAL native tab type + body, and an external plugin's
  descriptor registered later gets its native type too. This is what retires
  the fork's own right panel — and with it the duplicate toggle cluster
  (`toggleCluster` is gone from v0.19.1).
- native tab-chip icons via the `sidebar.right.pane.tab.title` seat, coloured
  built-in tab icons, file/folder glyphs from DSH's own `FileTypeIcon`.
- guide descriptions (DSH renders them while the guide lists <= 4 entries),
  tab bodies that fill the panel, and the 0.1.5-rc.2 adaptation work we were
  carrying by hand (peer/devDep pinning, primitives' transitive devDeps).

How the sync was done
Rebuilt the tree from the v0.19.1 tag rather than resolving 53 conflicted
files: our v0.18.0 delta was measured first and is only (a) one mechanical
rename `dsh-better-sidebar` -> `dsh-apes-sidebar` and (b) ten real edits. So:
tag tree + rename (scoped: code/config/scripts/tests/README, while the 46
historical docs/plans records and switch.sh's upstream package name stay
untouched) + re-applied deltas + our apes module.

Fork deltas re-applied on the new base
- src/client/apes/ (icons / locales / tabs): the three apes:* information-layer
  tabs (agents / apps / profile), registered through the same BetterSidebarService
  as the builtins — which is exactly why they now ride upstream's native adapter
  into the official sidebar for free.
- identity: package.json (name/version 1.2.0/description/forkedFrom), dsh.plugin.json
  (id/version), SIDEBAR_SERVICE_VERSION 1.2.0, README fork notice,
  docs/external-plugin-guide.md.
- scripts/switch.sh + the pnpm switch* scripts (apes <-> upstream two-line switch).
- tests/apes-tabs.spec.ts (unescaped: it starts from the v0.19.1 base).

Dropped
- the Phase A native-registration spike (`apes/native-tabs.tsx` + its spec): it
  re-derived by hand exactly what upstream's native layer already does — the
  hand-written bridge is dead weight now, and v0.19.1's own e2e/jsdom lanes
  cover the same seat contract far better.
- the unused apesProfileGuideDesc key and the two package.json.bak.* backups.

Verified on the new base: typecheck clean; build clean; 1351 passed / 9 skipped
(128 files), up from 1255 on the old base.

.github/workflows/ci.yml

@@ -35,7 +35,7 @@ jobs:
       # config; the runner has none by default.
       - name: Configure git identity for tests
         run: |
-          git config --global user.name "dsh-better-sidebar-ci"
+          git config --global user.name "dsh-apes-sidebar-ci"
           git config --global user.email "ci@dsh.invalid"
       - name: Install dependencies
         run: pnpm install --frozen-lockfile
@@ -84,7 +84,7 @@ jobs:
       # identity and rely on ambient config, which the runner lacks.
       - name: Configure git identity for tests
         run: |
-          git config --global user.name "dsh-better-sidebar-ci"
+          git config --global user.name "dsh-apes-sidebar-ci"
           git config --global user.email "ci@dsh.invalid"
       - name: Install dependencies
         run: pnpm install --frozen-lockfile
@@ -188,7 +188,7 @@ jobs:
         run: pnpm test:mount
 
       # Aggregate double-mount regression: a fixture aggregate bundle mounts
-      # dsh-better-sidebar under its own entry id BEFORE the plugin's bundle
+      # dsh-apes-sidebar under its own entry id BEFORE the plugin's bundle
       # row; the plugin must back off (no duplicate /sidebar/api, boot OK).
       # Uses the pinned DSH CLI installed above.
       - name: Aggregate double-mount regression

.github/workflows/release.yml

@@ -1,6 +1,6 @@
 name: Release
 
-# Publishes `dsh-better-sidebar` to npm via npm Trusted Publishing (OIDC) —
+# Publishes `dsh-apes-sidebar` to npm via npm Trusted Publishing (OIDC) —
 # no NPM_TOKEN secret required, provenance is attached to the tarball.
 #
 # Trigger: a GitHub Release is published (tag vX.Y.Z). The tag MUST match
@@ -12,7 +12,7 @@ name: Release
 # supports the stable DSH line); stable versions publish as `latest`.
 #
 # One-time npm-side setup (manual, on npmjs.com):
-#   1. package `dsh-better-sidebar` -> Settings -> Publishing access
+#   1. package `dsh-apes-sidebar` -> Settings -> Publishing access
 #      -> Trusted Publishers -> "Add Trusted Publisher".
 #   2. Provider: GitHub Actions
 #      Organization or user: omdsh-dev
@@ -66,7 +66,7 @@ jobs:
       # (see tests/smoke.spec.ts); the runner has none by default.
       - name: Configure git identity for tests
         run: |
-          git config --global user.name "dsh-better-sidebar-ci"
+          git config --global user.name "dsh-apes-sidebar-ci"
           git config --global user.email "ci@dsh.invalid"
 
       - name: Install dependencies