Bind `<CR>` in insert mode as an `<expr>` map to a `smart_return`
helper. Behaviour matches upstream vimwiki's `:VimwikiReturn`:
- On a list line with content → continue the list with the same
marker on a new line (preserving leading checkbox `[ ]` if any).
- On an empty list line (marker only) → clear the marker and break
out of the list with a plain newline.
- Inside a `|…|` table row → insert a fresh empty row below with
the same column count, cursor lands inside the first cell.
- Otherwise → plain `<CR>`.
Implementation note: the helper is `<expr>`-bound, which means
textlock is active and the buffer can't be mutated from inside the
callback. The function returns key sequences only — including
`<Esc>0DA<CR>` for the empty-list break and `<Esc>0li` for the
table-row cursor jump — so every effect flows through Vim's normal
keystroke pipeline and stays undo-coherent.
Both Lua and VimL counterparts shipped.
Tests: 4 new in scripts/test-keymaps.lua covering list continuation,
checkbox preservation, empty-marker break-out, and new table row.
Gates: 421 Rust / 35 Neovim / 12 Vim.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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