Step 52: SyntaxHighlighter walks tree-sitter CST to produce colored token spans (keyword, string, comment, number, function, parameter, type, operator, etc.) for Python, C++, and Elisp. Step 54: KeybindingManager with swappable profiles — VSCode (default), JetBrains, and Emacs. Each profile maps 25+ actions (file, edit, search, nav, view, code, build) to key combos. Supports custom overrides and reverse lookup. Design direction: editor targets VSCode/JetBrains look-and-feel. Keybinding profile selectable at startup. VSCode is default. Phase 3c totals: 37/37 tests pass across 5 steps (50-54). Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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