Option access:
- `base?.field` evaluates to `Option[field]`: a null base yields null.
A value field yields its address (`Option[int]` = `int*`); a pointer
field is loaded only on the non-null branch and selected with null.
Chaining (`n?.next?.a`) works through the pointer result.
- The AST `Attribute.optional` flag drives this in translate_attribute.
`own` nullable fix:
- `n: own U? = None` was rejected because the own-None check ignored the
`?` wrapper. The check now skips nullable annotations, so nullable owned
bindings accept None; non-null `own T = None` still fails.
LSP:
- member completion treats `n?.` as `n.` (base `n`, not `n?`), so fields
and methods are offered after `?.`; semantic tokens and diagnostics
already resolve through the optional attribute.
Probe: null `n?.a` prints the None branch; after `n = new U(5)`,
`q: Option[int] = n?.a; *q` = 5; `n?.next` null-checks; `U.__sizeof__()`
= 16; LSP completion after `n?.` offers `a`/`next` and diagnostics are
clean. Self-host 110/110; ListTest, GenericTest, GenericTest3/4,
PtrOpProbe, HashLibTest, NewTest, NewLifetimeTest, StructTest and
EscapeOkTest pass.
TermiNexus
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