Batch X Worker A: 5-29 block DnD DOM boundary readonly audit

Role

You are a leaf Reasonix coding worker. Do not spawn any other agent, runner, ACP process, Claude Code, Codex, Hermes, or Reasonix. Do not create, delete, or modify worktrees. Do not create new .codex/reasonix-tasks/*.md files.

Project

Project root for this run:

/mnt/Data1T/mnote-worktrees/0525-x-worker-a-5-29-dnd-dom-readonly

Task

Perform a read-only audit for the next small 5-29 editor runtime extraction around block drag-and-drop DOM helpers.

Focus only on these current symbols:

drop_indicator_from_target in rust/spikes/leptos-tiptap-spike/src/lib.rs
drop_indicator_from_point in rust/spikes/leptos-tiptap-spike/src/lib.rs
hovered_block_from_target in rust/spikes/leptos-tiptap-spike/src/lib.rs
helper dependencies used by those functions, such as target_element, direct_block_from_element, top_level_block_index, block_state_from_index, editor_root_element, editor_stage_element, and HANDLE_SHELL_SELECTOR
existing editor_runtime/block_dnd.rs

Required output

Write a handoff that answers:

Which exact helper, if any, can be moved next into editor_runtime/block_dnd.rs without moving Leptos signals, event listeners, or block reorder behavior?
Which functions must stay in lib.rs for now, and why?
What is the smallest safe implementation diff Codex should make next?
What commands should Codex run after that diff?
What browser smoke, if any, is needed to prove behavior did not regress?

Constraints

Read-only only. Do not edit source files, design docs, task files, generated wasm/js, or tests.
Do not run cargo build, cargo check, wasm-bindgen, browser tests, or dev servers.
You may run read-only commands such as rg, sed, git status, git diff --stat, and CodeGraph if available.
If you find the task needs implementation, report the proposed patch in prose only.
Keep the result narrow. Do not propose a broad drag-and-drop rewrite.

Acceptance contract

The run is acceptable only if:

Worktree diff is empty.
process-handoff.md and process-handoff.json exist.
The handoff includes the five required answers above.
The handoff does not claim code was changed or tests were run.

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