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

sdks/cli/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@sandbox-agent/cli",
-  "version": "0.1.4-rc.7",
+  "version": "0.1.6-rc.1",
   "description": "CLI for sandbox-agent - run AI coding agents in sandboxes",
   "license": "Apache-2.0",
   "repository": {
@@ -13,6 +13,9 @@
   "scripts": {
     "test": "vitest run"
   },
+  "dependencies": {
+    "@sandbox-agent/cli-shared": "workspace:*"
+  },
   "devDependencies": {
     "vitest": "^3.0.0"
   },