feat: draw to a Wayland Cairo surface with an error overlay

Entry point, grid maths, palette parsing and widget dispatch.

Uses conky_surface(), not cairo_xlib_surface_create: under
out_to_wayland the Xlib drawable and visual are both nil, so the idiom
every Conky-Lua tutorial uses cannot work here.

The pcall overlay lands before any widget exists, because Conky reports
a Lua fault as a blank screen with no message on any stream. Verified
by injecting a fault and seeing it reported. A missing widget names
itself in its own cell rather than leaving the cell empty.

conky.conf here is a development config with literal colours; the
templated one arrives with the UDT wiring.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

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