getInScopeSymbols gains crossFile parameter to include exported symbols from
all open buffers. Import graph tracks file dependencies, auto-maintained on
openFile/closeFile. Text-based fallback for parsers without Import AST nodes.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Adds multi-buffer management via openFile/closeFile/listBuffers/setActiveBuffer
RPC methods, plus indexWorkspace for scanning workspace files without opening
them. Language auto-detected from extension. 27 MCP tools total (was 22).
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>