fix(ralph-wiggum): use portable shebang in shell scripts

[mantrakp04]

Summary

• Change #!/bin/bash to #!/usr/bin/env bash in ralph-wiggum shell scripts
• Fixes compatibility issues on NixOS, WSL2, and other Linux distributions where /bin/bash may not exist

Test plan

• Tested setup-ralph-loop.sh --help works on WSL2 Ubuntu
• Tested setup-ralph-loop.sh "Test task" --max-iterations 3 creates state file correctly
• Verify scripts work on NixOS

Fixes #12880

🤖 Generated with Claude Code

[Copilot]

Pull request overview

This PR improves the portability of ralph-wiggum shell scripts by updating the shebang to use the env approach for finding bash. This ensures compatibility on systems where bash is not located at /bin/bash, such as NixOS and WSL2.

• Updated shebang from #!/bin/bash to #!/usr/bin/env bash in ralph-wiggum plugin scripts
• Fixes compatibility issues on NixOS, WSL2, and other Linux distributions

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
plugins/ralph-wiggum/scripts/setup-ralph-loop.sh	Updated shebang to use portable #!/usr/bin/env bash format
plugins/ralph-wiggum/hooks/stop-hook.sh	Updated shebang to use portable #!/usr/bin/env bash format

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[steveyegge]

LGTM. Using #\!/usr/bin/env bash is the correct portable shebang pattern - it finds bash via PATH rather than hardcoding /bin/bash which doesn't exist on NixOS and some other systems.