fix(pi): narrow revdiff review trigger

[umputun]

Summary

• narrow Pi revdiff skill triggers so ordinary code review requests do not launch the TUI
• clarify that captured revdiff annotations still route through the revdiff workflow
• bump plugin package version to 0.2.1

Fixes #188

[Copilot]

Pull request overview

This PR narrows the Pi integration’s “revdiff” skill/tool trigger guidance so normal autonomous code review requests won’t launch the interactive revdiff TUI, addressing issue #188. It updates both the skill documentation and the tool’s prompt guidelines to require an explicit user request for revdiff/interactive annotations, and bumps the Pi package version.

Changes:

• Tighten revdiff_review usage guidance to require explicit user intent (revdiff / interactive annotation pass / captured annotations).
• Clarify that ordinary “review the code/diff/changes” requests should be handled directly by the agent (without invoking revdiff).
• Bump revdiff-pi package version to 0.2.1.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
plugins/pi/skills/revdiff/SKILL.md	Narrows the skill’s trigger description and agent-usage guidance to require explicit revdiff intent.
plugins/pi/extensions/revdiff.ts	Updates tool promptGuidelines to avoid revdiff invocation for ordinary autonomous review prompts.
package.json	Bumps Pi package version from 0.2.0 to 0.2.1.

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