samiandClaude Opus 5
facd851824
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The tree is Ubuntu-first, but the Linux-specific surface is about ten files and already sits at the bottom of the I/O and RPC stacks. Rather than fork the repo or scatter ifdefs, platform differences go behind narrow seams with one backend directory per OS, selected centrally in cmake/platform.cmake. Linux stays the reference implementation and its behaviour does not change: the owning lanes (CORE, DAEMON) move today's Linux code behind the seams on Ubuntu first, with the suite still green, before any macOS code exists. A new PORT lane owns only the per-OS backends, so macOS work never writes shared logic and CLAUDE.md's lane rule stays intact. Adds ADR 0020 (the decision and phases), docs/08-porting.md (seam list, API mapping for macOS and Windows, dependency table, verification gates) and docs/agents/AGENT-PORT.md (the lane brief), plus the PORT row in the ownership table. Co-Authored-By: Claude Opus 5 <[email protected]>