table markdown rendering improvement

CLAUDE.md

@@ -168,9 +168,12 @@ UI thread redraws on its own tick (no channel; just the mutex).
 
 ## Gotchas
 
-- `tui-markdown` is pinned `=0.3.5`: later versions use `ratatui-core` (0.30
-  alpha types), incompatible with ratatui 0.29. Its gaps (no tables, literal
-  heading markers) are compensated in `src/markdown.rs`, not by upgrading.
+- `tui-markdown` is pinned `=0.3.5`: 0.3.7+ moved to `ratatui-core` (0.30 alpha
+  types), incompatible with ratatui 0.29 — 0.3.6 is the last 0.29-compatible
+  release, but *no* version (through 0.3.8) enables pulldown-cmark's table
+  extension, so upgrading still wouldn't render tables. Its gaps (no tables,
+  literal heading markers) are compensated in `src/markdown.rs`, not by
+  upgrading.
 - `wezterm-term`/`wezterm-surface` are not on crates.io: pinned to a git rev
   of the wezterm monorepo (keep both revs identical).
 - The compact pane *dynamically frames* Claude Code's input box rather than