chore(examples): declare @deepseek-ai/dsh-llm-pi-ai as an example dep

pi-ai is the library-backed twin adapter the tui-agent README already
points at ("swap one line to @deepseek-ai/dsh-llm-pi-ai"), and the
supported entry point for third-party providers (Anthropic, Google,
OpenRouter) mounted through the personal overlay under ~/.dsh. Making
it a declared workspace dep of the examples umbrella means
`pnpm install` resolves the symlink upstream so users configuring a
third-party provider via `~/.dsh/config.yaml` don't have to patch
`examples/package.json` locally (which their next git checkout would
wipe).

Placement matches the sibling llm-* cluster; workspace:* to match the
other adapters. No cordis.yml or README changes: mounting pi-ai
remains explicit and opt-in per the provider-routed-llm-adapters
Agent Note.

examples/package.json

@@ -26,6 +26,7 @@
     "@deepseek-ai/dsh-jsonrpc": "workspace:*",
     "@deepseek-ai/dsh-llm": "workspace:*",
     "@deepseek-ai/dsh-llm-deepseek": "workspace:*",
+    "@deepseek-ai/dsh-llm-pi-ai": "workspace:*",
     "@deepseek-ai/dsh-llm-replay": "workspace:*",
     "@deepseek-ai/dsh-lsp": "workspace:*",
     "@deepseek-ai/dsh-lsp-local": "workspace:*",

pnpm-lock.yaml

@@ -267,6 +267,9 @@ importers:
       '@deepseek-ai/dsh-llm-deepseek':
         specifier: workspace:*
         version: link:../packages/llm/llm-deepseek
+      '@deepseek-ai/dsh-llm-pi-ai':
+        specifier: workspace:*
+        version: link:../packages/llm/llm-pi-ai
       '@deepseek-ai/dsh-llm-replay':
         specifier: workspace:*
         version: link:../packages/support/llm-replay