WF-0155 - Causal Undo Family: design cycle

[flyingrobots]

Design cycle promoting docs/method/backlog/cool-ideas/causal-undo-family.md to a full design doc.

Three operations, laddered: (1) regional time-rewind (materialize + diff -> proposal strand, ship first), (2) surgical revert (attribution -> inverse -> anchor-transform commutation, typed obstructions on overlap), (3) basis-closure cascade (dependency = non-commutation, never temporal order; minimal honest bases; ring-based blast-radius preview with budget + surgical escape valve). Every variant is a forward counter-edit proposal strand behind preview -> admit. Blocked by Historical Basis Preview (goalpost 3) and proposal strands / :admit (goalpost 4); g? attribution is the front end.

Design doc lands as docs/design/0155-causal-undo-family.md (draft).

[coderabbitai]

🔗 Related PRs

#23 - feat(echo): add Echo release gate witness [closed]
#135 - Docs: lock Jim causal roadmap [closed]
#193 - docs: lock Jim roadmap evidence slices [merged]
#205 - Document graph-backed rope runtime gate [merged]

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