Restructure the incubation into two extensions plus interchangeable data-labelling
schemes, shipped as a stack of three PRs:
- This PR (base): shared scaffolding + the trust-annotations extension.
- action-metadata moves to its own stacked PR.
- The IFC/FIDES work moves out of specification/draft/ entirely — it is one
data-labelling scheme (ifc.fides.v1) that fills the trust-annotations
evidenceRef slot, not an extension and not a sibling. It lands in a schemes/
folder built to hold alternative approaches (data-class, capability tokens,
cosigning, sequence-shape, attestation) so no single academic model is baked
into the wire.
README, sep-disposition, related-work, trust-model, open-questions and the
decision log are reframed accordingly (two extensions + a schemes folder; the
range of candidate schemes drawn from the SEP-1913 thread and cited literature).
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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