contract.dev proposal

### Project name

contract.dev

### Short description

[contract.dev](https://contract.dev/) offers Stagenets: private testnets that follow mainnet state and come with built-in features to test and understand contract behaviour before launch.

Think of them as private copies of mainnet, enhanced with devtools and analytics.

### Website URL (optional)

https://contract.dev/

### LLMs Text URL (optional)

_No response_

### Thumbnail image URL (optional)

https://contract.dev/contract_dev_logo.png

### Banner image URL (optional)

_No response_

### Twitter / X URL (optional)

https://x.com/contractdotdev

### GitHub repo or NPM package URL(s)

https://github.com/contract-dot-dev/NFTMarketplace
https://github.com/contract-dot-dev/MintableERC20

### Tags

testing
debugging-tools
analytics
developer-experience

### Category

Smart Contract Development & Toolchains

### Confirmations

- [x] I checked `output/taxonomy.json` for existing tags and categories
- [x] I provided at least one GitHub repo or NPM package URL