[slides] Update slide deck - AI Engines: replace Crush/OpenCode with Pi

[github-actions]

Slide Deck Updates

Changes Made

• Updated the "AI Engines" slide to replace the outdated "Crush / OpenCode — experimental multi-provider AI coding agents" bullet with Pi — a fully supported, provider-agnostic built-in engine (Copilot, Anthropic, OpenAI/Codex authentication), per docs/src/content/docs/reference/engines.md and docs/src/content/docs/engines/pi.md.

Layout Issues Fixed

• None detected — bullet list still has 5 items with similar line lengths; no overflow introduced.

Content Sources Reviewed

• Scanned docs/src/content/docs/reference/engines.md (5 supported built-in engines: Copilot, Claude, Codex, Gemini, Pi) and docs/src/content/docs/reference/engines.md's "Unsupported engine samples" section, which explicitly lists Crush, OpenCode, Aider, Cursor, DeepSeek Harness, Kiro, and Pydantic AI as sample-only, unsupported integrations.
• Reviewed docs/src/content/docs/engines/pi.md for Pi engine details.

Focus Mode

(default: global sweep)

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Verification: Built slides with Marp (npx @marp-team/marp-cli slides/index.md --html --allow-local-files) successfully; reviewed rendered content for accuracy.

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• expires on Aug 21, 2026, 8:24 AM UTC-08:00