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>
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