Consolidate into single self-contained script

Collapse the entire multi-file structure (bin/, lib/, prompts/) into
one executable bash script at the repo root. Everything is inlined:
frontmatter helpers, prompt strings, and the Claude stream-json
progress display (now a function calling node --input-type=module).

- plan-status is now `plan-refine status` subcommand
- Remove dead Puppeteer/Brave CDP code (chatgpt-send.mjs,
  plan-refine-brave) — superseded by Codex CLI approach
- Remove npm artifacts (package.json, package-lock.json) — sole
  dependency was puppeteer-core for the dead browser automation
- Simplify install.sh to just symlink + prereq checks
- Update .gitignore: node_modules/ -> *.feedback-*.md

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

install.sh

@@ -1,72 +1,9 @@
 #!/usr/bin/env bash
-# install.sh — Set up plan-tools on this machine
 set -euo pipefail
-
 SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
-BIN_DIR="$SCRIPT_DIR/bin"
-
-echo "plan-tools setup"
-echo "════════════════"
-echo ""
-
-# Make scripts executable
-chmod +x "$BIN_DIR/plan-refine"
-chmod +x "$BIN_DIR/plan-status"
-echo "Made scripts executable."
-
-# Check for Oracle
-if command -v oracle &>/dev/null; then
-    echo "Oracle: $(oracle --version 2>/dev/null || echo 'installed')"
-else
-    echo "Oracle not found. Installing via npm..."
-    npm install -g @steipete/oracle
-fi
-
-# Set up Oracle browser profile (first-time login)
-ORACLE_PROFILE="$HOME/.oracle/browser-profile"
-if [[ ! -d "$ORACLE_PROFILE" ]]; then
-    echo ""
-    echo "Oracle needs a one-time browser login to ChatGPT."
-    echo "This will open Chrome — log into ChatGPT, then close the browser."
-    read -rp "Run browser login now? (y/N) " confirm
-    if [[ "$confirm" == "y" || "$confirm" == "Y" ]]; then
-        oracle --engine browser \
-            --browser-manual-login \
-            --browser-keep-browser \
-            -p "Hello, this is a test. Reply with: Oracle setup complete." \
-            --write-output /dev/null || true
-        echo "Browser profile saved."
-    else
-        echo "Skipped. Run this later:"
-        echo "  oracle --engine browser --browser-manual-login --browser-keep-browser -p 'test'"
-    fi
-fi
-
-# Symlink to PATH
-echo ""
-TARGET_BIN="$HOME/.local/bin"
-mkdir -p "$TARGET_BIN"
-
-for script in plan-refine plan-status; do
-    target="$TARGET_BIN/$script"
-    if [[ -L "$target" ]]; then
-        rm "$target"
-    fi
-    ln -s "$BIN_DIR/$script" "$target"
-    echo "Linked: $script -> $target"
-done
-
-# Check PATH
-if ! echo "$PATH" | tr ':' '\n' | grep -q "^${TARGET_BIN}$"; then
-    echo ""
-    echo "NOTE: $TARGET_BIN is not in your PATH."
-    echo "Add this to your shell profile:"
-    echo "  export PATH=\"\$HOME/.local/bin:\$PATH\""
-fi
-
-echo ""
-echo "Setup complete. Available commands:"
-echo "  plan-refine <plan.md>         Run one ChatGPT evaluation iteration"
-echo "  plan-refine <plan.md> --init  Add plan frontmatter to a file"
-echo "  plan-status                   Show all plans and their pipeline stage"
-echo ""
+mkdir -p ~/.local/bin
+ln -sf "$SCRIPT_DIR/plan-refine" ~/.local/bin/plan-refine
+echo "Linked: plan-refine -> ~/.local/bin/plan-refine"
+[[ ":$PATH:" != *":$HOME/.local/bin:"* ]] && echo "NOTE: Add ~/.local/bin to your PATH"
+command -v codex &>/dev/null || echo "NOTE: Install codex CLI (npm i -g @openai/codex)"
+command -v claude &>/dev/null || echo "NOTE: Install claude CLI"