feat(bin): add x-visit-folders script for bulk zoxide registration (#294)

* feat(bin): add x-visit-folders script for bulk zoxide registration

* fix(bin): fix x-visit-folders usage exit code, no-op fallback, and count increment

- usage() now accepts optional exit code; --help exits 0
- Remove no-op subshell cd fallback in visit_dir(), just log failure
- Replace ((count++)) with count=$((count + 1)) to avoid set -e trap

local/bin/x-visit-folders.md

@@ -0,0 +1,23 @@
+# x-visit-folders
+
+Register level-1 subdirectories with zoxide so they appear in
+`z` completions.
+
+## Usage
+
+```bash
+x-visit-folders [options] [directory]
+```
+
+- `directory` – target directory (defaults to current directory)
+- `-n`, `--dry-run` – list directories without adding them
+- `-v`, `--verbose` – print each directory as it is visited
+- `-h`, `--help` – show usage information
+
+## Example
+
+```bash
+x-visit-folders ~/Code/ivuorinen
+```
+
+<!-- vim: set ft=markdown spell spelllang=en_us cc=80 : -->