feat(coding-agent-vim-tooling): added vim tooling special-key aliases

- 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.

scripts/vim-edit-benchmark.py

@@ -158,7 +158,7 @@ def run_benchmark_for_model(
             no_rules=True,
             no_session=True,
             startup_timeout=30.0,
-            request_timeout=60.0,
+            request_timeout=120.0,
         ) as client:
             client.install_headless_ui()