Give -v to verbose, move --version to -V (closes #64)

urfave/cli's built-in version flag claimed -v by default, colliding with
the -v verbose alias used on every subcommand; "mfer -v --version" failed
to parse with an internal-sounding parser error. Verbose is the more
common meaning of -v in tools that offer both, so verbose now keeps -v at
the root and on every subcommand, and the version flag takes the capital
-V (--version still works).

User-visible change: -v alone now prints help with verbose logging rather
than the version; use -V or --version for the version.

The --version flag and the version subcommand now share one printer, so
they emit identical output. Adds tests covering -v, --verbose, --version,
-v --version, and --verbose --version (exit code and output).

Model: opus-4-8

TODO.md

@@ -24,6 +24,8 @@ only thing left of the `chore/align-repo-policies` branch is the list below.
 
 # Completed Steps
 
+- 2026-09-21: fixed the `-v` collision between `--verbose` and `--version`;
+  verbose owns `-v`, and version answers to `--version` and `-V` (#64)
 - 2026-08-09: added `.prettierrc`/`.prettierignore`, gave `script/fmt` and
   `script/fmt-check` one shared prettier file set via `script/prettier`, dropped
   the `|| true` that hid prettier failures, and added a node-based Dockerfile