feat(mpack): true chunked HTTP/1.1 streaming for push_stream — eliminate b''.join bottleneck
- Add _open_chunked_connection() module-level function as the testable seam for http.client.HTTPConnection/HTTPSConnection (mirrors _open_url pattern) - Add _send_chunked_frame() and _send_terminal_chunk() helpers that encode each frame as '{size_hex}\r\n{data}\r\n' and '0\r\n\r\n' respectively - Refactor HttpTransport.push_stream to stream frames incrementally: · H frame built first; Authorization signed over H frame bytes only · O frames compressed and sent one at a time (peak memory O(1 object)) · Transfer-Encoding: chunked, no Content-Length, no b''.join · Server can validate auth + start writing objects while later frames arrive · Error handling via http.client.HTTPException / OSError (not urllib) · Connection always closed in finally block - MSign signing upgrade: Authorization covers H frame bytes (not full body) · H frame carries embedded Ed25519 over canonical intent · Content-addressed objects self-verify (sha256: prefix) · E frame counts cross-validate stream integrity - tests/test_mpack_chunked_push.py: 30 TDD tests covering Transfer-Encoding, no Content-Length, H-frame signing, per-frame send(), memory boundedness, HTTP vs HTTPS connection selection, connection lifecycle, R/X/P/4xx response - tests/test_mpack_transport.py: updated _capture_push_request helper to use _open_chunked_connection seam instead of _open_url
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