Account Socket.IO server attachment skipped corpus

Bun compatibility slice

Account for js/third_party/socket.io/socket.io-server-attachment.test.ts at exhaustive corpus position 4056.

Bun currently disables the complete server-attachment suite with describe.skip. Home should resolve the SuperTest and extensionless support imports, expose SuperTest through Home's HTTP compatibility layer, preserve the suite-level todo, avoid unsupported or allowed-empty classification, and pin the fixture in the permanent third-party matrix.

Tracked from #66.

Implemented and pushed in 4bec480cd.

Home now resolves the attachment fixture's extensionless Socket.IO support import and default SuperTest import through the existing shared, callable SuperTest implementation. Bun's intentional suite-level skip is preserved and permanently asserted.

During verification, the permanent Express matrix caught and prevented a duplicate SuperTest registration from shadowing the shared callable implementation; the duplicate was removed before commit.

Verification:

• focused position 4056: 1 file, 0 failed, 1 todo, 0 unsupported/allowed-empty;
• Socket.IO positions 4050–4056: 7 files, 13 passed, 8 explicit todos, 0 failed/unsupported/allowed-empty;
• permanent gRPC error-stack, SQL adapter-contract, Express/third-party corpus, and 36-case diagnostic suites all pass.