Retire the readline front door and the repl-agent example

Delete packages/ui/stdio and examples/repl-agent; rename stdio-demo to
@deepseek-ai/dsh-tui-demo (TUI-only, refuses pipes before Loader boot).
tui-agent owns the coding composition inline; echo-agent and the CI demo
smoke move to the one-shot cli-demo bin, which gains -p/--prompt. The
UI-independent with-key e2es move verbatim to tui-agent. SDK wizard's
'stdio' interface becomes 'tui'. PTY testing stays confined to TUI
surfaces; all other subprocess tests ride pipes.

See .agents/notes/implemented/simplification/2026-07-20-retire-readline-front-door.md

pnpm-lock.yaml

@@ -90,6 +90,15 @@ importers:
         specifier: ^4.1.8
         version: 4.1.8(@types/node@22.20.0)(@vitest/coverage-v8@4.1.8)(jsdom@29.1.1)(vite@8.0.16(@types/node@22.20.0)(esbuild@0.28.1)(jiti@2.7.0)(tsx@4.22.4)(yaml@2.9.0))
 
+  apps/cli:
+    dependencies:
+      '@deepseek-ai/dsh-app-boot':
+        specifier: workspace:^
+        version: link:../../packages/ui/app-boot
+      '@deepseek-ai/dsh-paths':
+        specifier: workspace:^
+        version: link:../../packages/util/paths
+
   examples:
     dependencies:
       '@cordisjs/plugin-hmr':
@@ -2700,6 +2709,10 @@ importers:
         version: 4.0.0-rc.7(@cordisjs/plugin-include@1.0.4)(@cordisjs/plugin-loader@1.0.0-rc.5)
 
   packages/ui/app-boot:
+    dependencies:
+      js-yaml:
+        specifier: ^4.2.0
+        version: 4.2.0
     devDependencies:
       '@cordisjs/plugin-include':
         specifier: workspace:^
@@ -2710,6 +2723,15 @@ importers:
       '@deepseek-ai/dsh-invariants':
         specifier: workspace:^
         version: link:../../support/invariants
+      '@deepseek-ai/dsh-paths':
+        specifier: workspace:^
+        version: link:../../util/paths
+      '@deepseek-ai/dsh-system-prompt':
+        specifier: workspace:^
+        version: link:../../core/system-prompt
+      '@types/js-yaml':
+        specifier: ^4.0.9
+        version: 4.0.9
       cordis:
         specifier: ^4.0.0-rc.7
         version: 4.0.0-rc.7(@cordisjs/plugin-include@vendor+include)(@cordisjs/plugin-loader@vendor+loader)
@@ -2857,9 +2879,15 @@ importers:
       '@deepseek-ai/dsh-session':
         specifier: workspace:^
         version: link:../../core/session
+      '@deepseek-ai/dsh-session-persistence':
+        specifier: workspace:^
+        version: link:../../session-persistence/session-persistence
       '@deepseek-ai/dsh-session-title':
         specifier: workspace:^
         version: link:../../session-title/session-title
+      '@deepseek-ai/dsh-skill':
+        specifier: workspace:^
+        version: link:../../skill/skill
       '@deepseek-ai/dsh-system-prompt':
         specifier: workspace:^
         version: link:../../core/system-prompt