Steps 266-268: Phase 10a — semantic annotation core + sidecar persistence (32/32 tests)

Step 266: 5 semantic annotation AST types (Intent, Complexity, Risk,
Contract, SemanticTag) with JSON roundtrip and compact AST integration.
Step 267: Sidecar AST persistence (.whetstone/<file>.ast.json) with
save/load/list RPC methods, MCP tools, and permission enforcement.
Step 268: Phase 10a integration tests — multi-file sidecar workflow,
all 5 types in compact view, idempotent roundtrip, source isolation.

Also includes Sprint 10 plan, GUI/installer polish, and Emacs integration fixes.

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

editor/src/EditOps.h

@@ -313,7 +313,7 @@ inline bool EditorState::moveToMatchIndex(int index) {
     return true;
 }
 
-inline void EditorState::doFindNext(bool backwards = false) {
+inline void EditorState::doFindNext(bool backwards) {
     if (!active()) return;
     if (strlen(search.findBuf) == 0) return;
     refreshSearchMatches();
@@ -505,4 +505,3 @@ inline std::string EditorState::uiEventLabel(UIEventType type) {
     }
     return "unknown";
 }
-