[abruption]

Closes #112.

Summary

• split the canonical core into ordered functional segments under session_peer_core/, including dedicated Codex, Claude, Antigravity, SSH, reply, diagnostics, update, registry, send, and CLI boundaries
• add a deterministic stdlib-only generator that keeps session_peer.py as the directly executable, remote-streamable single-file artifact
• reject stale generated source in the supported test matrix, package job, and PyPI release build
• keep canonical segments and the generator in the sdist while leaving the wheel runtime contract unchanged
• document the flat shared-namespace composition and update the translated architecture ADR

The flat composition deliberately preserves the single module global namespace used by existing imports and behavior-focused monkey-patching tests. The generated runtime has no new dependency or destination-side installation requirement. cc_peer.py, relay/OAuth behavior, and live infrastructure are unchanged.

Verification

• python3 -m unittest discover -s tests -v — 377 passed, 14 optional skips
• relay extra suite — 80 passed
• MCP extra suite — 14 passed
• Python 3.9 generator check and standalone tests — 3 passed
• deterministic generator check and translated-doc structural checks — 8 passed
• wheel/sdist exact-content tests — 3 passed
• fresh Python 3.13 wheel and sdist installs both report session-peer 1.0.0b1