# Implementation Plan: Project Launch Script

**Branch**: `003-project-launch-script` | **Date**: 2025-12-20 | **Spec**: [specs/003-project-launch-script/spec.md](specs/003-project-launch-script/spec.md)
**Input**: Feature specification from `/specs/003-project-launch-script/spec.md`

## Summary

Create a root-level bash script (`run.sh`) to automate the setup and concurrent execution of the backend (FastAPI) and frontend (Svelte/Vite) development servers. The script will handle dependency checks, installation, and graceful termination of both processes.

## Technical Context

**Language/Version**: Python 3.9+, Node.js 18+  
**Primary Dependencies**: `uvicorn`, `npm`, `bash`  
**Storage**: N/A  
**Testing**: Manual verification of service availability; `pytest` for backend logic if any.  
**Target Platform**: Linux  
**Project Type**: Web application (frontend + backend)  
**Performance Goals**: Services accessible within 30 seconds.  
**Constraints**: Must handle `SIGINT` (Ctrl+C) to kill all child processes.  
**Scale/Scope**: Developer utility script.

## Constitution Check

*GATE: Must pass before Phase 0 research. Re-check after Phase 1 design.*

| Gate | Status | Rationale |
|------|--------|-----------|
| Python 3.9+ | PASS | Backend uses Python 3.9+ |
| Node.js 18+ | PASS | Frontend uses Node.js 18+ |
| Project Structure | PASS | Follows `backend/`, `frontend/` structure |
| Executable from root | PASS | Planned as `./run.sh` |

**Post-Design Re-evaluation**: Design artifacts (research, data-model, contracts) confirm compliance with all project principles. No violations found.

## Project Structure

### Documentation (this feature)

```text
specs/003-project-launch-script/
├── plan.md              # This file
├── research.md          # Phase 0 output
├── data-model.md        # Phase 1 output
├── quickstart.md        # Phase 1 output
├── contracts/           # Phase 1 output
└── tasks.md             # Phase 2 output
```

### Source Code (repository root)

```text
run.sh                   # New launch script

backend/
├── src/
│   └── app.py
└── requirements.txt

frontend/
├── src/
└── package.json
```

**Structure Decision**: Option 2: Web application. The script will reside in the root to orchestrate both directories.

## Complexity Tracking

> **Fill ONLY if Constitution Check has violations that must be justified**

| Violation | Why Needed | Simpler Alternative Rejected Because |
|-----------|------------|-------------------------------------|
| None | - | - |