Critical: Change file.stream({start,end}) → file.createReadStream({start,end})
to match real webtorrent ^2.5.1 API (WHATWG ReadableStream vs Node Readable).
Important #1: RFC 7233 compliance — clamp end >= total to total-1 instead
of rejecting with 416. Only reject when start >= total or start > end.
Important #2: Attach stream error handlers to prevent unhandled crashes
on peer disconnect or missing pieces.
Minor: Add tests for range clamping (bytes=50-999999 on 100-byte file)
and out-of-range fileIdx. All 6 tests passing (green).
Co-Authored-By: Gerald KERMA <devel@cybermind.fr>
Implement handleStream(engine, req, res) for WebTorrent streaming with
HTTP Range support. Handles 200 full, 206 partial, 416 unsatisfiable,
404 not found responses. MIME type detection from file extension.
Tests via node --test with fake engine/request/response (all green).
Co-Authored-By: Gerald KERMA <devel@cybermind.fr>
