docs(a11y): add Phase 6 manual verification checklist (#21)

A device checklist for everything the automated audit cannot reach:
VoiceOver speech, the More Content rotor, custom-content ordering,
completion announcements, Voice Control label-in-name, the colour/motion/
transparency settings simctl cannot toggle, iPad keyboard focus order,
and both system design languages (classic vs Liquid Glass).

Grounded in the actual implementation rather than generic guidance: each
item quotes the real label/announcement/field it verifies (e.g. "Refresh
all tracked domains", "Lookup complete for <domain>", the More Content
field order) and carries a [Px] tag pointing at the phase that introduced
it. Organised by iOS setting so each is toggled once, with a seed-data
step up front because the dense rows and widget are otherwise untestable
— the same reason they are unverified by the audit today. Includes a
sign-off matrix, a defect-log template, and the known-deferred items so a
ViewThatFits overflow is filed correctly rather than mistaken for a
regression.

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