v0.9.42 — Docs & website overhaul + cross-platform ready-flag fix

Primarily a documentation & website overhaul, plus a small cross-platform fix.

📚 Docs & website

• Provider count corrected 18 → 19 (Kimi Code is its own provider) across README, the model guide, the website (all 14 languages) and the pitch deck.
• Builtin skill library corrected to the real 15 packs with a full table (README said 11 and 9 in different places).
• The File & Media Toolkit is now documented as a headline capability — every agent can read/convert PDF·Excel·Word·PowerPoint, build slide decks, transcribe video, and edit images.
• CLI reference completed (brains, jobs, key set, editor; channels = all 6); stale model recs refreshed (glm-4.6 → glm-5.2, kimi-k2.5 → k2.6).
• The site's "latest version" badge (stuck on v0.8.0) now self-updates from VERSION; Linux labelled "experimental" consistently; pitch deck refreshed.

🔧 Fixed

• macOS/Linux: the world-ready handoff flag is now written via OS.get_temp_dir() instead of the Windows-only $TEMP, so the shell actually receives the ready signal instead of relying on a ~9s timeout.

⚠️ Known issue (under investigation)

• On some Macs the world can stay stuck on the boot logo and never render as the wallpaper. Everything else runs (daemon, agents, networking) — it's Godot's first frame not drawing, so the boot splash never clears. This is a render-path issue, separate from the flag fix above, and a fix is in progress once the Mac-side console output pins the cause.

Full notes: see CHANGELOG.md.

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