* ⚡ perf: Index the Conversation Fetch and Trim the Client Message Projection
* ⚡ perf: Memoize the Message Tree per Cache Write
* ⚡ perf: Serve Message Reads via the Trimmed Projection and an Ownership Probe
* ⚡ perf: Defer Collapsed Disclosure Bodies Until First Expansion
* ⚡ perf: Progressively Mount Long Threads from the Scroll Anchor
* 🩹 fix: Address Codex Findings on Retention, Anchoring, and Cache Bounds
* 🩹 fix: Poll the Oversized Export Precondition Through the Progressive Mount
* 🩹 fix: Keep Video Results in the Client Message Projection