When prompt files contain shell metacharacters (\$VAR, backticks,
\$(...)), passing them as -p "\$(cat file)" causes the shell to expand
those sequences before the CLI tool ever receives the text. This
silently corrupts prompts built from user-authored PLAN.md content.
Replace all -p "\$(cat /tmp/gsd-review-prompt-{phase}.md)" patterns
with cat file | cli -p - so the prompt bytes are passed verbatim via
stdin. Affected CLIs: gemini, claude, codex, qwen. OpenCode and cursor
already used the pipe-to-stdin pattern.
Closes#2200
Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>
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