FABRIC-3.md §XXXV.14: flag missing fault-triggered SSM_MODE_C0 fallback

Raised discussing what the multiuser DoE might reveal: the intended
design is a faulting VM drops to SSM_MODE_C0 and continues as a plain,
non-adaptive VM rather than faulting outright. Confirmed via source:
ssm_l8_update() computes its mode purely from workload metrics, no
fault input anywhere -- a real regression from the hosted StarForth
repo's design ("forgot to carry that over... building the stadium"),
not invented here. ssm_l8_force_config() already exists as the natural
hook a real fix would use. Flagged and logged, not built -- per the
explicit instruction to keep the campaign running and log bugs/gaps as
they surface rather than stopping to fix each one.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01BWpNjdwPtFLuVLaAq44L9K

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