📦 PromptFuel v0.2.0

Core model/config foundation. Provider usage import is not yet implemented.

Included in this release:

• src/core/providers.ts — provider IDs (claude, codex), labels, isKnownProvider guard
• src/core/quotaTypes.ts — quota window IDs (5h, 7d), labels, ProviderQuotaState type
• src/core/configDefaults.ts — pure config defaults (no VS Code dependency; smokeable)
• src/core/formatQuota.ts — status bar text for no-data, disabled, unknown states
• src/config.ts — VS Code config loader under promptFuel.*
• src/dataFolder.ts — data folder path helper wrapping context.globalStorageUri
• src/extension.ts — status bar item wired with placeholder no-data status; refresh command updates bar; open data folder uses real extension storage URI
• scripts/smoke-core.cjs — pure-logic smoke tests (no VS Code dependency) covering provider validation, quota window labels, status text formatting, and config defaults
• package.json — added promptFuel.refreshIntervalSeconds setting; added smoke:core script