feat(bash-env): extract the shared DSH_* environment registry into its own package

tsconfig.host.json

@@ -138,6 +138,7 @@
     { "path": "./packages/llm/llm-deepseek" },
     { "path": "./packages/llm/llm-pi-ai" },
     { "path": "./packages/bash/bash-local" },
+    { "path": "./packages/bash/bash-env" },
     { "path": "./packages/bash/pwsh-local" },
     { "path": "./packages/bash/tool-pwsh" },
     { "path": "./packages/sandbox/sandbox" },