Each `-> &T` / `-> &mut T` function now records which parameter it borrows (a parameter index, `self`, or unknown) in a return-borrow registry, keyed by symbol and by `Class.method`. A reference initialized from a call registers only the summarized argument (the receiver for methods), and `return f(...)` checks only that argument; callees without a summary keep the conservative "all borrowed arguments" fallback. Borrowing a compiler-owned (`own`) local cannot escape the frame any more: `_OwnerOutlivesFrame` rejects `own`/slife bindings and only accepts reference parameters, `self`, statics, and non-owned heap pointers, so `return id(&ownLocal)` and `return refBinding` are rejected while `return id(&heapPtr)` still passes. The LSP mirrors the owned-local rule.
TermiNexus
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