* Add document-format RFC draft
* Align document-format RFC with graph-storage implementation
* Update writing style
* Recharacterize resource source chain as LWW-element-set, not add-wins OR-set
* Add Rev identity rationale framed against Git, plus patch-id future item
* Correct RFC inaccuracies found in implementation audit
* Mark unimplemented retirement coarsening and leader election as future; fix resurrection mechanism
* Add hot-log to the on-disk payload list in the architecture diagram
