[Swift] Reconnect cross-file extension members to their owner

[samchon]

Problem

A Swift extension declared in a different file keeps a qualified name such as Box.doubled, but static graph construction cannot reconnect it to the Box node. Swift owner reconnection is file-local; only C++ currently receives a project-wide reconnect pass. The method therefore has no ownerId and no Box -> doubled contains edge.

Reproduction

• Box.swift: struct Box {}
• Box+Ext.swift: extension Box { func doubled() -> Int { 2 } }

The current same-file extension regression passes, masking the cross-file loss.

Acceptance

• Reconnect transparent Swift extension owners across the full project graph.
• Preserve qualified identities and emit the semantic contains edge.
• Keep ambiguous or absent owners unresolved rather than guessing.
• Add a two-file end-to-end static graph regression.

Discovered in independent Review Round 4 for #97.

[samchon]

Review Round 5 found a remaining Swift ownership consequence: enums may conform to protocols and extensions may declare conformance, but the static inheritance pass currently drops enum sources and transparent extension heritage. The fix for #112 must retain pending extension heritage until a unique receiver resolves, emit enum/extension protocol edges, and fail closed when the receiver is ambiguous.

[samchon]

Resolved by #97: cross-file Swift extension members and enum conformances reconnect to their owning type project-wide.