Defines the S11 yardstick BEFORE either stack exists: pinned commons-ref
as identical input, metrics M1-M4, the verbatim liveness-asymmetry
declaration, five binding LLM non-determinism rules for S10/S11, and a
ban on comparing offline numbers with live numbers.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01AaQCFnfsh3tfq1VfzdJpoi
