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/platforms/linux-x64/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@sandbox-agent/cli-linux-x64",
-  "version": "0.1.4-rc.7",
+  "version": "0.1.6-rc.1",
   "description": "sandbox-agent CLI binary for Linux x64",
   "license": "Apache-2.0",
   "repository": {