pi-synthetic v0.4.0

5cca252: Add /synthetic:quotas command to display API usage quotas

A new slash command that shows your Synthetic API subscription quotas in a rich terminal UI:
- Visual usage bar with color-coded severity (green/yellow/red based on usage)
- Aligned columns showing limit, used, and remaining requests
- ISO8601 renewal timestamp with relative time formatting (e.g., “in 5 hours”)
- Closes on any key press
The command is only registered when SYNTHETIC_API_KEY environment variable is set.
a8cacfb: Add Synthetic web search tool

New tool synthetic_web_search allows agents to search the web using Synthetic’s zero-data-retention API. Returns search results with titles, URLs, content snippets, and publication dates.

Note: Search is a subscription-only feature. The tool will only be registered if the SYNTHETIC_API_KEY belongs to an active subscription (verified via the usage endpoint).