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fasterthanlime 
Refactor VTable system: Direct/Indirect styles, OxRef/OxMut, builder patterns

Major architectural refactor of the facet vtable system for better code sharing
and reduced binary bloat.

- Remove ThinPtr/WidePtr in favor of PtrConst<'a>/PtrMut<'a>/PtrUninit<'a>
- Add OxRef<'a>/OxMut<'a> - shaped pointers bundling ptr + shape
- Add Ox<'a> enum for ownership tracking (like Cow for shaped pointers)

- VTableDirect: for concrete types, uses raw *const ()/*mut (), returns T directly
- VTableIndirect: for generic containers, uses OxRef/OxMut, returns Option<T>
- VTableErased enum wraps both styles
- Shape::call_* helpers dispatch to either style transparently

- vtable_direct! macro for sized types with compile-time known traits
- VTableIndirect::builder() for generic containers with runtime dispatch
- All container vtables (Array, Option, Result, List, Map, Set) use builders
- No more positional arguments - named builder methods only

- Hash trait is generic over H: Hasher, can't store directly in vtable
- HashProxy type-erases the hasher for vtable storage
- Enables hash support without wrapper function bloat

- impls_core/impls_alloc/impls_std -> impls/core/alloc/std/crates
- New internal/ module for facet's own types (Shape, Def, etc.)
- Cleaner separation of concerns

- Copy, Send, Sync, Eq, Unpin stored as bitflags on Shape
- Set via ShapeBuilder methods: .copy(), .send(), .sync(), .eq()

- ThinPtr -> *const () or PtrConst<'a>
- WidePtr -> OxRef<'a> or OxMut<'a>
- vtable_ref! -> vtable_direct! or VTableIndirect::builder()
- ValueVTable -> VTableDirect or VTableIndirect
- Closures in vtables -> named fn items

WIP: Some impl modules still need migration to new API.

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Source Files on job 20059345204.1