refactor: List is slice-backed { items: []T; cap } — directly iterable
items is now a []T slice whose .len IS the live element count (cap = allocated
capacity), so a List iterates directly: `for xs.items (e) { ... }`. A
`len :: (self) -> i64 #get => items.len` accessor keeps `xs.len` reads working;
`.len` WRITES become `.items.len`. List stays 24 bytes (`[]T`=16 + cap=8).
- list.sx: append/ensure_capacity/deinit rewritten for the slice backing. deinit
guards the free on `cap > 0` (true ownership) and resets via explicit
ptr=null/len=0 (a `.{}` slice assignment yields a garbage len; `.[]` is the
empty-slice literal but can't be assigned to a generic []T — both worked around).
- Compiler coupling updated: comptime_vm makeStringList/readStringList write/read
items as a {ptr,len} fat pointer at field 0 + cap at field 1; control_flow
listView views an `items: []T` slice (keeps the legacy {[*]T,len} shape too).
- Migrated List `.len` writes to `.items.len` in sched.sx + ui/{render,pipeline,
glyph_cache} + platform/{sdl3,android,uikit}.
- Snapshots: List's type-table layout changed → ~40 .ir + memory/0800 (items now
prints as a slice) regenerated; diagnostics/1183 retargeted to a genuine
many-pointer (xs.items is a slice now). Example memory/0840 locks for-each.
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