grep_files default excludes now include bare directory names
(e.g. "node_modules") alongside the "dir/*" variants. The glob
matcher requires a '/' to match "dir/*", so the bare form skips
the directory traversal entirely instead of descending and filtering
each file — fixes 7MB result payloads from node_modules (#2200).
Added a background version check that fetches the latest GitHub
release tag once per TUI session. When a newer version is available,
the footer renders a persistent toast:
"vX.Y.Z available — run `codewhale update` and restart"
Silent on network errors (5s timeout).
Hunter Bown
e0c8e8d89a