c36fd9204591d2ee041a5c6785984f3be6d55360
Step 263: saveBuffer/saveAllBuffers RPC methods write editBuf to disk with workspace path resolution and parent dir creation. 12/12 tests. Step 264: State-based undo/redo via HeadlessUndoStack. Snapshots recorded automatically before mutations; undo/redo restore AST + editBuf. 12/12 tests. Step 265: Phase 9e integration tests — save after undo/redo, mixed undo states across buffers, full open→mutate→diagnose→undo→redo→save. 8/8 tests. Phase 9e complete: 32/32 tests. Sprint 9 total: 244/244 across 5 phases. 34 MCP tools. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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