An unreleased `diff` mod is being built in the anthropics/claude-code repo with a docked pane and pluggable backends

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Commits on 2026-09-15 and 2026-09-16 in `anthropics/claude-code` continue a `mods/diff` build-out that no CHANGELOG entry mentions: a docked diff pane whose hunks scroll under a pinned header, an inline `/diff` dialog off fullscreen, keyboard walk that stops at the first and last file instead of wrapping, and a backend abstraction where the git backend owns its own closing empty row. The newest commit (#94653) makes the first edit open the pane only where the layout docks it, and #94594 defers running git until the built-in panel would rather than at session start. Reading the repo's `mods/` commits stays weeks ahead of the published changelog.