# Change: Add initial specifications for existing capabilities

## Why
The project has no specifications documenting its current behavior. Adding initial specs will establish a baseline for future development, making it easier to plan changes, avoid regressions, and onboard contributors.

## What Changes
- New spec: `glass-rendering` — Core WebGL2 rendering pipeline and glass effects
- New spec: `parameter-controls` — Real-time parameter editor UI
- New spec: `background-system` — Background types and custom media support
- New spec: `preset-management` — Export/import of parameter presets
- New spec: `shape-system` — SDF shapes, superellipse, and blob merging

## Impact
- Affected specs: All new (no existing specs)
- Affected code: None — documentation only, no code changes
