docs(spec): island core design

Sub-project 1 of the move toward a Modesty-style integrated desktop: a
top-centre island on DP-1 hidden behind a sliver, a clock pill and a status
pill that slide out of it, a sound panel, and the removal of waybar.

Records the decisions taken while brainstorming: the island floats over
windows with no exclusive zone, privacy capture recolours the sliver rather
than revealing the pills, the clock pill flicks the desktop icon, app icon and
app name on workspace change and app open but not on focus change, the volume
icon has no gestures beyond opening its panel, and the flag images move into
this repo. Modesty is GPLv3, so only its ideas are used.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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