Document assistant insights feature

[ethanpalm]

Updated agent suggestions documentation to reflect the new assistant insights feature introduced in PR #5174. The documentation now explains that suggestions come from two sources: pull request changes and conversation insights from user questions.

Files changed:

• ai/suggestions.mdx - Added documentation for conversation insights, the assistant insights toggle, and updated the review suggestions section to describe both suggestion types

Generated from feat: UI & config for assistant autopilot suggestions @rtbarnes

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Note

Scope: Updates ai/suggestions.mdx to cover a second source of suggestions and related UX.

• Adds assistant-driven source: suggestions from analyzed assistant conversations ("Conversation insights")
• Retains and clarifies PR-based monitoring; explains backfill behavior and disable effects
• Updates overview to state two sources and how suggestions appear in the dashboard
• Revises "Review suggestions" to show that items may come from PRs or assistant topics
• Minor copy/structure changes; no code changes

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