- Added `<escape>` and `<return>` as special-key aliases in `parser.ts`, mapping to `Esc` and `CR`.
- Clarified Vim tool behavior so `open` replaces the active buffer and non-paused `kbd` calls auto-save.
- Updated the Vim prompt contract to treat `insert` as raw text entered only after entering INSERT mode.
- Increased `scripts/vim-edit-benchmark.py` `request_timeout` from 60s to 120s for longer edit runs.
- Added `VimTool` in `src/tools/vim.ts` with `open`, `kbd`, `insert`, and `pause` actions.
- Implemented `src/vim/{buffer,engine,parser,commands,render,types}.ts` for interactive Vim modes and operators.
- Updated `src/tools/index.ts` to normalize `edit`/`vim` tool selection and skip the inactive edit variant.
- Added `vim` registration in `BUILTIN_TOOLS` and `toolRenderers` for discoverability and output formatting.
- Added streaming renderer snapshots with viewport, caret focus, and diff output for `vim` calls.
- Added `test/tools/vim.test.ts` and `scripts/vim-edit-benchmark.py` coverage for the new editor stack.
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