Moves runEditAndPropose, the askClaude gate/prompt/progress wrapper, the
EditTarget type, the editTurn/askEditInstruction/turnSeq state, and the
cowriting.editDocument command registration out of TrackChangesPreviewController
into a new EditFlow (src/editFlow.ts), reachable from the review webview
(delegates) and, from Task 6 on, the thread controller. extension.ts now
constructs EditFlow before the preview controller and routes
acceptAllProposals/rejectAllProposals directly to ProposalController, dropping
the preview-controller indirection. E2E suites that drove the old
trackChangesPreviewController.{setEditTurnForTest,runEditAndPropose,askEditInstruction}
seams now drive the same seams on editFlow.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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