Fix inherited apply usage flags

[brownie-ricon]

Summary

• parse wp apply flags from the current argv instead of inherited usage_* environment
• keep --yes / -y as the only non-interactive approval signal for this invocation
• add a regression proving inherited usage_yes/usage_y cannot add Spaces headlessly
• refresh README test count

Verification

• mise run test (34/34)
• mise run lint
• usage_yes=true usage_y=true bats --filter 'refuses' test/apply.bats
• CALLER_PWD="$PWD" mise exec -- readme build --check
• bash -n .mise/tasks/apply/_default test/apply.bats
• git diff --check
• swift test (5/5)

No real wp apply, butthair spaces:add, Space/window movement, or desktop mutation was run; all apply coverage used mocks.

[quick-ricon]

Closed as superseded by direct fix on #57 in 36ee53a. Brownie's finding/regression were kept, but the implementation uses fold's usage-defaults-clear-inherited-env pattern instead of manual argv parsing.