Fix run-hook.cmd script directory resolution on Unix

[njt]

Summary

• run-hook.cmd uses ${BASH_SOURCE[0]:-$0} to find its own directory, but when Claude Code invokes the command via sh -c, BASH_SOURCE is unavailable and $0 resolves to the cwd instead of the script's location
• This causes exec bash "${SCRIPT_DIR}/session-start" to look in the wrong directory, producing SessionStart:startup hook error on every session start
• Fix: prefer $CLAUDE_PLUGIN_ROOT (which Claude Code sets as an env var) when available, falling back to the existing $0-based resolution for direct invocation

How it was diagnosed

• Debug instrumentation revealed SCRIPT_DIR resolving to the user's cwd (e.g. ~/Source/some-project) rather than the plugin cache directory
• The session-start script never executed — the wrapper failed before reaching it
• Confirmed by testing in a tmux child session where the cwd differed from the plugin cache path

Test plan

• Start a Claude Code session from a directory that is NOT the plugin cache — no SessionStart:startup hook error should appear
• Verify the superpowers skill content is injected into the session context
• Direct invocation of run-hook.cmd session-start from CLI should still work (fallback path)

🤖 Generated with Claude Code

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