First go at a pi agent extension

[sergei1152]

General first go at a pi extension.

It adds 2 new tools. web_search and web_fetch. It also modifies the system prompt so these tools get used more often:

## Grounding and web usage

You should proactively use available web tools to ground your answers when doing so would improve correctness, freshness, or source quality.

- Use web_search when the task involves current information, external facts, source discovery, recent changes, or any claim you are not highly confident about.
- Use web_fetch when the user provides a URL, when a search result should be verified against the source, or when primary-source content would improve the answer.
- Prefer grounded, sourced answers over unsupported recall when freshness or factual precision matters.
- If a grounded answer would likely be better than answering from memory, use the web tools first.

Been dogfooding for a bit.

You can dogfood yourself at:

pi install npm:@parallel-web/pi-extension@0.0.2