Follow-up to the within-unit static-members feature (0977dc16). Static
class/record members declared in one unit can now be used from another through
the compiled `.bif` interface (the `--unit-cache` / separate-compilation path),
not only when every unit is recompiled from source.
The `.bif` wire format already carried most static facts; the values were being
dropped by consumers around the serialiser:
* Export clones — CloneFieldDecl / ClonePropertyDecl / CloneMethodDecl now copy
IsClassVar / ClassVarEmitName, property IsStatic, and method IsStatic. The
same clone gap silently broke the pre-existing IsWeak / IsDefault round-trip
([Weak] fields and `default` properties exported as plain) — fixed here too.
* Method static-ness — TRoutineSig gained an IsStatic field (a final non-virtual
instance method and a static method both carry VTableSlot = -1, so a dedicated
flag is required). Populated on export, encoded/decoded symmetrically
(BLAISE-IFACE version 3 -> 4), and applied to the synthesised TMethodDecl on
import so `TypeName.StaticMethod()` resolution succeeds.
* Import — ImportClassEntry / ImportRecordEntry register an imported static var
as the shared global (bare + qualified skVariable symbols carrying the
*decoded* GlobalEmitName, never recomputed — the importing unit's prefix
differs), carry property IsStatic onto TPropertyInfo, and import the type's
static ConstDecls so `TFoo.MaxItems` resolves.
* Parser — out-of-line `static function T.M` bodies in a unit's implementation
section are now parsed (mirrors the program-level standalone path).
Tests: TestStaticMembers_CrossUnit_QBE / _Native in cp.test.e2e.sepcompile
(cold + warm `--unit-cache` round-trip, both backends), and
TestRoundTrip_StaticMembers_Preserved /
TestRoundTrip_WeakField_And_DefaultProperty_Preserved in cp.test.unitinterface.
Full suite green on QBE- and native-built runners (3912 tests); all fixpoints
pass (incl. warmcache, which exercises the .bif round-trip); bif-coverage clean.
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