v0.3.2

Patch release. Fixes two latent bugs in the command dispatcher.

1. `mainwp api-keys` was crashing with
   `✗ Command 'api-keys' has no entry point.`

   Root cause: bin/mainwp looked up the entry-point function as
   `cmd_api-keys` (with a hyphen), but bash function names cannot
   contain hyphens - the function is defined as `cmd_api_keys`
   in the file. The help lookup had already done the
   ${cmd//-/_} translation; the main dispatch had not.

2. ` --help` was silently broken for 10 of the 16 commands
   (api-keys, clients, costs, monitoring, pages, posts, settings,
   tags, updates, users). The other six worked. The cause:
   `_mainwp_parse_common_flags` normalises `--help` to the
   literal string `help` in REMAINING, but those 10 commands only
   matched the case pattern `-h | --help` - the raw flag, not
   the normalised `help`. Three commands (sites, skill, deps)
   already had the correct `-h | --help | help` pattern; the
   others did not.

Both bugs were uncovered while testing v0.3.1. The smoke suite
now has a regression test that exercises ` --help` for
every command, so this category of breakage is caught at CI time
from now on.

61 smoke tests, all passing. Upgrade with
`brew update && brew upgrade mainwp`.