Release v2.0.9

🚀 Feature Drop — Playground, CLI Fingerprints, ACP

✨ New Features

• #234 — Model Playground — Dashboard page to test any model directly (provider/model/endpoint selectors, Monaco Editor, streaming, abort, timing metrics)
• #223 — CLI Fingerprint Matching — Per-provider header/body ordering to match native CLI binaries, reducing account flagging risk
• #235 — ACP Support — Agent Client Protocol module with CLI agent discovery and /api/acp/agents endpoint

🧹 Housekeeping

• #192 & #200 — Closed as stale (needs-info, v1.8.1)