fix(ralph-wiggum): move multi-line bash from command to setup script

Fixes anthropics/claude-code#12170

The ralph-wiggum slash commands had multi-line bash scripts in their
\`\`\`! blocks. Claude Code's security check blocks commands with
newlines to prevent command injection, causing the error:

  "Command contains newlines that could separate multiple commands"

Changes:

ralph-loop.md:
- Remove multi-line bash from code block
- Keep single-line call to setup script
- Keep scoped allowed-tools for security

cancel-ralph.md:
- Replace multi-line bash with step-by-step instructions
- Add Read tool to allowed-tools (needed to read iteration count)

setup-ralph-loop.sh:
- Add completion promise display logic (moved from ralph-loop.md)
- Uses COMPLETION_PROMISE variable directly instead of reading from file

plugins/ralph-wiggum/scripts/setup-ralph-loop.sh

@@ -174,3 +174,30 @@ if [[ -n "$PROMPT" ]]; then
   echo ""
   echo "$PROMPT"
 fi
+
+# Display completion promise requirements if set
+if [[ "$COMPLETION_PROMISE" != "null" ]]; then
+  echo ""
+  echo "═══════════════════════════════════════════════════════════"
+  echo "CRITICAL - Ralph Loop Completion Promise"
+  echo "═══════════════════════════════════════════════════════════"
+  echo ""
+  echo "To complete this loop, output this EXACT text:"
+  echo "  <promise>$COMPLETION_PROMISE</promise>"
+  echo ""
+  echo "STRICT REQUIREMENTS (DO NOT VIOLATE):"
+  echo "  ✓ Use <promise> XML tags EXACTLY as shown above"
+  echo "  ✓ The statement MUST be completely and unequivocally TRUE"
+  echo "  ✓ Do NOT output false statements to exit the loop"
+  echo "  ✓ Do NOT lie even if you think you should exit"
+  echo ""
+  echo "IMPORTANT - Do not circumvent the loop:"
+  echo "  Even if you believe you're stuck, the task is impossible,"
+  echo "  or you've been running too long - you MUST NOT output a"
+  echo "  false promise statement. The loop is designed to continue"
+  echo "  until the promise is GENUINELY TRUE. Trust the process."
+  echo ""
+  echo "  If the loop should stop, the promise statement will become"
+  echo "  true naturally. Do not force it by lying."
+  echo "═══════════════════════════════════════════════════════════"
+fi