fix(gnovm): persist function-local declared types referenced by saved values

[ltzmaxwell]

• Function-local declared types are never SetType'd (only package-level types are, at addpkg), so persisting a value referencing one writes a dangling RefType; after a node restart every access panics with unexpected type with id ... — the realm state is permanently unreadable. Reproduces on master via interface-typed package vars and closure captures.
• Fix: a localTypeSaver walk in saveObject persists reachable function-local types before SetObject; copyTypeWithRefs preserves ParentLoc so the local type's TypeID survives the persist/reload round trip.
• Defense-in-depth: a debugAssert-gated invariant in SetObject panics at save time on any dangling function-local type ref, so a missed route fails loudly inside the rolled-back tx instead of committing unreadable state.
• Tests: restart txtars are the true reproducers (fail on master) — interface var / closure / bound method value, cross-realm, p/-package local type, map-key TypeID stability, reload→mutate→resave across two restarts; zrealm_localtype* filetests guard the save side under -tags debugAssert and pin the on-the-wire RefType shape.
• Also unblocks fix(gnovm): match Go's call-time dispatch for interface-bound method values #5737, whose call-time method dispatch persists the interface-boxed operand and newly hits this hole. ADR: gnovm/adr/pr5894_local_type_persist.md.

[Gno2D2]

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