Compiler:
- moving an owned value (`b: own T = a`) marks the source released; this
now also applies outside OBS files when the target is declared `own`.
Later reads/field access fail with a LifetimeError.
- transferring an owned pointer into a value-typed target
(`_U3: U = _U2`) now fails with CastError before codegen. Previously it
emitted a bitcast of the struct value to a pointer and died in mlir-opt.
LSP:
- track `own` declarations and moves per function and report
"cannot use 'x': its value was moved" as an error diagnostic on later
uses (severity 1, so editors paint it red).
- a rebinding clears the moved state.
Probe: `_U: own U = new U(1); _U2: own U = _U; print(_U2.a)` is clean;
`print(_U.a)` produces the move diagnostic and the compiler LifetimeError;
`_U3: U = _U2` produces the CastError. Self-host 110/110; ListTest,
GenericTest, GenericTest3/4, PtrOpProbe, HashLibTest, NewTest,
NewLifetimeTest, StructTest, EscapeOkTest and OopInheritTest pass.
TermiNexus
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