refactor(lsp): clean up lsp_servers references and update prompts to use PascalCase

- Remove dead lsp_servers function from tools.ts
- Update utils.ts to reference LspServers (OpenCode built-in)
- Update AGENTS.md: 7 tools → 3 tools
- Update init-deep.ts prompts to use PascalCase OpenCode tools
- Update refactor.ts prompts to use PascalCase OpenCode tools

src/tools/lsp/utils.ts

@@ -55,7 +55,7 @@ export function formatServerLookupError(result: Exclude<ServerLookupResult, { st
       `Supported extensions: ${server.extensions.join(", ")}`,
       ``,
       `After installation, the server will be available automatically.`,
-      `Run 'lsp_servers' tool to verify installation status.`,
+      `Run 'LspServers' tool to verify installation status.`,
     ].join("\n")
   }