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Unify how every composer preserves unsent work, sends, and handles uploads. L1 foundation (packages/core/drafts): - createDraftStore factory + self-registering cleanup-registry replacing the hand-maintained WORKSPACE_SCOPED_KEYS list; register-all-drafts guarantees registration completeness. Fixes the confirmed cross-user draft leak (persistence + in-memory) on logout / workspace delete. L3 send paradigm: - useComposerSubmit: one await-then-render contract (lock/spin, keep-on-fail, clear-on-success, single-flight, submit-time upload-gate), adopted by comment/reply/edit, create-issue, quick-create, and chat. Per-surface: - Comment/Reply/Edit: attachments moved into the persisted draft. - Create Issue: draft split into shared/manual/agent/activeMode with non-destructive mode switching + migration for old flat drafts. - Chat: optimistic send converted to await-then-render (kept server-driven cancel restore_to_input); chat draft keys registered for cleanup. L2 upload coordinator (ownership inversion, Linear-validated shape): - upload-coordinator + DraftUpload placeholder: uploads owned by a module coordinator that outlives the component, state persisted in the draft; AbortController + abort-on-logout; interrupted-on-reload. Comment surface fully wired. Create-issue/chat upload wiring is a documented residual. Verified: core + views typecheck clean; core 1064 + views 2928 tests pass. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>