[WIP] Fix position of set -e directive in install_cargo_bundle script

[Copilot]

Thanks for asking me to work on this. I will get started on it and keep this PR's description up to date as I form a plan and make progress.

Original prompt

Please apply the following diffs and create a pull request.
Once the PR is ready, give it a title based on the messages of the fixes being applied.

[{"message":"The 'set -e' directive is placed inside the conditional block, which means the script will only fail fast when installing cargo-bundle but not when checking for its existence. Consider moving 'set -e' to the top of the script (after the shebang and comments) to ensure consistent error handling throughout the entire script.","fixFiles":[{"filePath":"script/install_cargo_bundle","diff":"diff --git a/script/install_cargo_bundle b/script/install_cargo_bundle\n--- a/script/install_cargo_bundle\n+++ b/script/install_cargo_bundle\n@@ -4,11 +4,12 @@\n \n # This script should be platform-agnostic (eg. no unix-only references like /dev/null).\n \n+set -e\n+\n cargo_location=$(dirname \"$(which cargo)\")\n if test -f \"$cargo_location/cargo-bundle\"; then\n     echo \"cargo-bundle already exists, not installing.\"\n else\n-    set -e\n     cargo install cargo-bundle --git=https://github.com/burtonageo/cargo-bundle --rev ae4c76e92c08774bf54ff077b1c52e3d1cd6c16d\n     echo \"Successfully installed cargo-bundle to location $cargo_location\"\n fi\n"}]},{"message":"The git revision hash is hardcoded without explanation. Consider adding a comment explaining why this specific commit is required, or document the rationale for pinning to this revision to aid future maintenance.","fixFiles":[{"filePath":"script/install_cargo_bundle","diff":"diff --git a/script/install_cargo_bundle b/script/install_cargo_bundle\n--- a/script/install_cargo_bundle\n+++ b/script/install_cargo_bundle\n@@ -9,6 +9,8 @@\n     echo \"cargo-bundle already exists, not installing.\"\n else\n     set -e\n+    # Intentionally pin to a specific commit for deterministic CI installs.\n+    # This avoids unexpected behavior changes from newer upstream revisions.\n     cargo install cargo-bundle --git=https://github.com/burtonageo/cargo-bundle --rev ae4c76e92c08774bf54ff077b1c52e3d1cd6c16d\n     echo \"Successfully installed cargo-bundle to location $cargo_location\"\n fi\n"}]}]

[BunsDev]

Superseded by #15 which implements all four fixes.