Resolve the -f short flag conflict on `project delete` where --format
claimed -f despite the specification reserving it for --force.
Changes:
- Add -f short alias to --force on the delete command, aligning with
the spec: `agents project delete [--force|-f] [--yes|-y] <NAME>`
- Remove -f short alias from --format on delete (keep --format long
form only); the spec does not define --format on this command
- Update module docstring to reflect spec-aligned flag signatures
- Add BDD scenario exercising -f via CliRunner to validate the Typer
argument parser maps -f to --force (not --format)
ISSUES CLOSED: #911
brent.edwards