Sprints 273-276: Polyglot FFI Glue, Symbol Index, and LSP Proxy (steps 1893-1912)

Sprint 273 — PolyglotFFIGlueGenerator (steps 1893-1897):
  ABIBoundaryExtractor, CHeaderEmitter, RustPythonBindingEmitter,
  GoCppBindingEmitter. Extracts exported symbols from toComponent provider
  and emits C ABI + language-specific bindings.

Sprint 274 — More Binding Pairs + DWARF (steps 1898-1902):
  CppJSBindingEmitter (N-API), RustGoBindingEmitter (#[no_mangle]),
  DWARFBoundaryAnnotator (DW_TAG_* + crossLangBoundary),
  FFIGlueDispatcher (routes by fromLang→toLang pair),
  MCP tool whetstone_generate_ffi_glue (#92).

Sprint 275 — Cross-Language Symbol Index (steps 1903-1907):
  SCIPEmitter (SCIP JSON, one doc/language, caller+provider roles),
  CrossLanguageSymbolTable (byLangName_ + byScip_ dual index),
  SymbolIndexUpdater (nodeKey diff, clear-and-rebuild),
  SymbolIndexOrchestrator (orchestrate + update),
  MCP tool whetstone_emit_symbol_index (#93).

Sprint 276 — LSP Proxy Core (steps 1908-1912):
  LSPProxyServer (JSON-RPC 2.0 dispatcher),
  LanguageServerRouter (routeByUri/routeByLanguageId),
  CrossLanguageBoundaryDetector (detect/detectWithUri/detectInLanguage),
  CrossLanguageDefinitionResolver (resolve/resolveFromUri → DefinitionLocation).
  End-to-end: Python call site goto-def resolves to Rust sort-core provider.

100/100 tests passing across all four sprints. Architecture gate clean.
LoRA sessions recorded for all sprints (~14k tokens captured).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

editor/src/Sprint273IntegrationSummary.h

@@ -0,0 +1,16 @@
+#pragma once
+#include <string>
+
+namespace whetstone {
+
+struct Sprint273IntegrationSummary {
+    int  stepsCompleted          = 5;
+    int  bindingPairsImplemented = 2;   // RustPython + GoCpp
+    bool success                 = true;
+
+    std::string sprintName() const {
+        return "Sprint 273: PolyglotFFIGlueGenerator";
+    }
+};
+
+} // namespace whetstone