PruneTool v1.2 — Windows

Add prune CLI, JS config, PyInstaller build, auto-gateway launch

- prune_cli.py: interactive chat CLI with Copilot-style model picker,
  broker auto-routing, daily token tracking, streaming responses
- llms_prunetoolfinder.js: user-facing model config (replaces .json);
  provider/maxContext auto-inferred, live context fetch from provider APIs
- prunetool_main.py + prunetool.spec: PyInstaller binary entry point;
  bundles gateway + proxy into prunetool.exe + prune.exe
- CLI backend: auto-detects claude/gemini CLI for subscription users
  (no API key needed); CLI checked before API key on every call
- Auto-gateway launch: prune chat opens prunetool.exe in a new terminal
  window automatically if gateway not running
- PromptAssist.jsx: dashboard tab for prompt building
- .gitignore: exclude build/ and dist/ (binaries go to GitHub Releases)

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