fix: fix bun install bug (#62)

* fix: fix bun install bug

* refactor: consolidate executable check into assertExecutable helper

- Add assertExecutable() to cli-shared that checks and attempts chmod
- Simplify CLI and SDK spawn code to use the shared helper
- Fix cli-shared package.json exports (.js not .mjs)
- Add global install instructions to SDK error message

* chore(release): update version to 0.1.6-rc.1

* fix: add cli-shared package to Dockerfiles

* chore(release): update version to 0.1.6-rc.1

* fix: add cli-shared publishing to release workflow

* chore(release): update version to 0.1.6-rc.1

* fix: handle already-exists error during crate publish

* chore(release): update version to 0.1.6-rc.1

pnpm-lock.yaml

@@ -288,6 +288,10 @@ importers:
         version: 5.9.3
 
   sdks/cli:
+    dependencies:
+      '@sandbox-agent/cli-shared':
+        specifier: workspace:*
+        version: link:../cli-shared
     optionalDependencies:
       '@sandbox-agent/cli-darwin-arm64':
         specifier: workspace:*
@@ -306,6 +310,18 @@ importers:
         specifier: ^3.0.0
         version: 3.2.4(@types/debug@4.1.12)(@types/node@25.1.0)
 
+  sdks/cli-shared:
+    devDependencies:
+      '@types/node':
+        specifier: ^22.0.0
+        version: 22.19.7
+      tsup:
+        specifier: ^8.0.0
+        version: 8.5.1(jiti@1.21.7)(postcss@8.5.6)(tsx@4.21.0)(typescript@5.9.3)(yaml@2.8.2)
+      typescript:
+        specifier: ^5.7.0
+        version: 5.9.3
+
   sdks/cli/platforms/darwin-arm64: {}
 
   sdks/cli/platforms/darwin-x64: {}
@@ -315,6 +331,10 @@ importers:
   sdks/cli/platforms/win32-x64: {}
 
   sdks/typescript:
+    dependencies:
+      '@sandbox-agent/cli-shared':
+        specifier: workspace:*
+        version: link:../cli-shared
     devDependencies:
       '@types/node':
         specifier: ^22.0.0