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/state/UIFlags.h

@@ -23,6 +23,8 @@ struct UIFlags {
     bool showAnnotateWizard = false;
     bool showProjectWizard = false;
     bool showAgentWizard = false;
+    bool requestLayoutReset = false;
+    bool requestBottomCollapse = false;
     int bottomTab = 0; // 0=Output,1=AST,2=Highlighted
     LayoutPreset layoutPreset = LayoutPreset::VSCode;
     FocusRegion focusTarget = FocusRegion::None;