OpenCode v1.14.21 released. TL;DR: • LSP pull diagnostics for C#/Kotlin • Refactored session compaction for token efficiency • Mistral Small reasoning support • BOM preservation in text tools LSP & Language Servers • Added comprehensive support for LSP pull diagnostics (`textDocument/diagnostic` and `workspace/diagnostic`). ▸ Solves missing diagnostics for languages that rely on client pulls (like C# and Kotlin) by seamlessly merging push and pull diagnostics natively. • Replaced `csharp-ls` with `roslyn-language-server` as the default C# provider, delivering vastly improved, Roslyn-powered language intelligence. Session Compaction • Re-engineered context compaction to use a strict, structured Markdown template that preserves file paths, errors, and task states accurately. • Compaction now seamlessly anchors off previous summaries, intelligently hiding prior compaction turns from the prompt to maximize token budgets. • Turn splitting is now calculated at the message boundary, preventing token overflow when a single large turn exceeds the preservation budget. • Truncates tool output at 2000 characters during summarization passes to prevent context window explosion. Models & Tools • Added reasoning variant support (`reasoningEffort`) for Mistral Small (`mistral-small-latest`, `mistral-small-2603`). • Text tools (`edit`, `write`, `apply_patch`) now strictly preserve Byte Order Marks (BOM) during file read/write round-trips. • The TUI now fails fast with clear errors when attaching to a corrupted or invalid session, preventing hangs. • Fixed project caching for bare Git repositories by correctly resolving the Git common directory. Compare: github.com/anomalyco/open…