Unquoted $VARIABLE in a shell command, and why my test suite missed it for months

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Bug: Config file had this, unchanged for months: "command": "node $CLAUDE_PROJECT_DIR/.claude/hooks/session.js start" Environment variable inside a shell command inside a JSON string. When the runtime reads the JSON and invokes the command through a shell, the shell expands $CLAUDE_PROJECT_DIR and word-splits it. If the expansion…

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