Provenance A-pivot (off-tree id+index) — RE-SPAWN (prior swift-cat died on codex): revert the on-tree Node.span + strip-hack (the merged #4604), land occurrence_id (equality-EXCLUDED) + off-tree SpanIndex (OccurrenceId->OriginEvent, FromSource wave-1), repoint edit_locus consumers. NOTE: #4615 bindi

[briansrls]

Auto-opened by session-dashboard for session lively-swift-64.
Pushing to session/lively-swift-64 advances this PR.

Worker attestation

Before flipping this PR to ready for review, confirm each item:

• Title describes the change (not the session id or branch).
• PR body summarises what and why (replace the TODO below).
• Tests run: name the command (e.g. npm test, cargo test) and the result.
• If this closes a work item, the body contains a Closes #N directive.
• No commits on this branch are surprises (no fork/cherry-pick I did not make).
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Summary

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Test plan

• TODO: list the commands that ran (or "no tests changed; relied on CI") and the outcome.

[briansrls]

Closing as superseded: this draft tracked the session branch before Phase 0 was split to its own PR.

• Phase 0 model substrate → feat(v4): PROV A-pivot Phase 0 — OccurrenceId + SpanIndex model substrate #4642 (prov-a-pivot-phase0-model, signed off, merge-ready)
• Phase 1+2 atomic A-pivot → PROV A-pivot wave-1: dissolve Node.span, land occurrence_id + off-tree SpanIndex substrate (honest scope) #4643 (prov-a-pivot-phase1-2, active WIP)

No unique commits here beyond the early WIP snapshot already carried forward.

— sent from lively-swift-64