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Closes the table-rewriter cluster from SPEC §13.1. Server-side (ops module): - `render_blank_table(cols, rows)` — pure templating: header row, separator `|--|--|--|`, then `rows` empty data rows. Wired through `table_insert` which dispatches a `TextEdit` at the cursor. - `table_align_edit` — locates the `TableNode` containing the cursor line, computes max width per column across every row, re-emits the table with each cell space-padded to its column's width. The parser drops `|---|---|` separator rows but sets `TableNode.has_header`; the renderer re-inserts a padded separator after the header so the result still parses. - `table_move_column_edit` — column-under-cursor swap with the left or right neighbour (`dir = "left" | "right"`). Cursor column is computed by counting pipe separators before the cursor's byte offset on the row's line. Column widths swap alongside the data so the post-swap table stays aligned. No-ops cleanly when the swap would fall off either edge. Editor glue: - `lua/nuwiki/commands.lua` / `autoload/nuwiki/commands.vim` — the three "not yet implemented" stubs are replaced with real LSP dispatchers. `table_insert` accepts optional `cols`/`rows` arguments (defaults: 3×2). - Default keymaps `gqq` / `gq1` / `gww` / `gw1` now call `table_align`; `<A-Left>` / `<A-Right>` call `table_move_column_left` / `_right`. No more "deferred" notifications on the table keys. Tests: 8 new in `cluster_b_table_rewriters.rs` — blank-table shape (3×2 + 1×1), column-width alignment with separator-row repad, swap- right shape, swap-left clamp at column 0, no-table-found fallbacks, COMMANDS list completeness. Total 410 Rust tests pass; clippy clean; Neovim keymap harness still 20/20. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>