Enhancement: LSP auto-configure for LLM code completion in chat

[Delqhi]

Enhancement: LSP Auto-Configure for LLM

Inspired by

OpenCode — automatically configures language servers for the LLM

What it does

LSP integration should automatically provide code completion, diagnostics, and go-to-definition to the LLM during chat sessions.

Proposed behavior

• When sin-code chat starts, detect workspace language (Go, Python, TS, etc.)
• Auto-start relevant LSP server (gopls, pyright, tsserver, rust-analyzer)
• Feed LSP diagnostics to the LLM as context ("file has 3 errors on lines X, Y, Z")
• sin_code_complete tool — LLM can request completions at a position

Current state

• sin-code lsp command exists — lists detected LSP servers on PATH
• internal/lsp/ package exists
• Missing: auto-start LSP + feed diagnostics to LLM

Priority: Low

Effort: Medium