Initial implementation of TriggerShell

A Python CLI (typer) that bootstraps Node/pnpm and launches a Next.js 16 web
app for running configured shell scripts: YAML config validated by a shared
Zod schema, dynamic per-script forms mapped to shadcn controls, argv-safe
execa execution with live WebSocket streaming, SQLite/Drizzle run history,
and optional argon2 session + API token auth.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

.gitignore

@@ -0,0 +1,22 @@
+# Python
+__pycache__/
+*.py[cod]
+*.egg-info/
+.eggs/
+build/
+dist/
+.venv/
+venv/
+.pytest_cache/
+.ruff_cache/
+
+# Runtime data (created by `triggershell start/dev` in whatever directory the config lives in)
+.triggershell/
+
+# Local config files a developer might create while testing against this repo
+/triggershell.config.yaml
+
+# Editors / OS
+.DS_Store
+.idea/
+.vscode/