Why: PR #73 merged a branch whose worktree carried stale submodule
pointers, regressing modules/{backend,documents,frontend,ui} on main to
pre-#71 commits; documents also advanced with the file-preview proposal
(PR #23).
Evidence: submodule status now matches each module's main tip
(backend 239cf76, documents 5882448+, frontend fb219e0, ui efa6c69,
core fd44179 unchanged); make test combo verification green.
Impact: composed checkout sees the merged chat-order and proposal work
again; no source changes in this repo beyond pointers and the task card.
Refs: task feature/file-preview-proposal.
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What
Evidence
Task card: .task/feature-file-preview-proposal.md