Splits the original §22 two-tier model (deployment → project=corpus) into
three tiers (deployment → project → RFC collection). Project owns one
content repo; collections are typed subfolders declared by .collection.yaml
manifests (git-truth). Reconciles the accumulated role vocabulary onto one
{owner, contributor} enum attached at {global, project, collection}, with
downward additive inheritance and no negative override. Adds BDD scenarios
(Part C) for role usage, invitation, and empty states. Re-slots the roadmap
to fold the tier into the not-yet-shipped Plan B (mig 028) + M3-frontend.
Session 0072 (spec). Revises docs/design/multi-project-spec.md §22.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Ben Stull
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