2026 04 29 Codex Fix Discussion Suggestion Regressions

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• block-discussion, discussion-kit, comment-kit: Rebuild discussion indexes from editor state so accept and reject updates, inline text summaries, and deleted comments stay current.

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• suggestion, suggestion-base-kit, suggestion-kit, suggestion-node: Fix block and inline suggestion regressions around inline voids, links, line breaks, block voids, and trailing-block normalization.

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• block-list, code-drawing-node, date-node, equation-node, excalidraw-node, media-audio-node, media-embed-node, media-file-node, media-image-node, media-video-node, mention-node, link-node: Keep Slate children mount points and suggestion wrappers stable for static and media-style nodes.