Document PHP 8.5 support status (docs/php85-limitations.md) and fix php84-limitations.md lazy-objects claim

[lisachenko]

Summary

From the PHP 8.5 support audit (PR #597):

1. docs/php85-limitations.md does not exist. docs/php84-limitations.md set the precedent; 8.5 needs the equivalent. Verified content for it (PHP 8.5.10 + 8.6.0beta2, audit harness on the PR branch):

   • Works: pipe operator |> in woven bodies; clone with; #[\NoDiscard] (copied to proxy, join-point dispatch preserves the value path); attributes on class constants incl. #[\Deprecated]; closures/FCC as parameter defaults (merged earlier); final promoted properties and static asymmetric visibility for non-intercepted properties; self/parent reflection resolution.
   • Broken / limited (tracked separately): closures/FCC in attribute arguments (Non-scalar attribute arguments (enum cases, objects, PHP 8.5 closures) crash proxy generation #601), promoted-property interception incl. final promoted (Property interception breaks promoted constructor properties (parse error or silently lost assignments) #599), enum const-expression case values (Enum proxies lose constant-expression case values (invalid backed enum generated) #600), new in initializers under INTERCEPT_INITIALIZATIONS (ConstructorExecutionTransformer rewrites new inside constant expressions (fatal on load) #603), global constants in attribute args (Global constants in attribute arguments crash weaving (parser-reflection namespace resolution) #602), class-level attributes (Class-level attributes break class→trait conversion (woven trait has parse error) #598).
   • Static properties (incl. 8.5 static asymmetric visibility) are never interceptable via access() — hooks don't exist for static properties; worth stating explicitly.

2. Factual error in docs/php84-limitations.md:36: it claims the framework's Container "uses lazy objects internally". It does not — src/Core/Container.php uses a hand-rolled closure/factory dance (addLazyService()/materializeService()). Either reword the doc or actually adopt lazy objects (Adopt PHP 8.4 native lazy objects (Container, CachedAspectLoader, ReflectionConstructorInvocation) #606 tracks adoption).