BE-037: diff ignores the context path ./ prefix + // meta/launch split

Now
DONE

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Context

Reported by gritzko 2026-07-09: in the pager, jab diff then spell :./test "no hunks" (bar diff //journal/be/test, SRC_ROOT set) and, SRC_ROOT unset, bar diff ///be/test (correct) but the view re-runs the BARE diff (first hunk core/discover.js) the context path is not respected. Three causes traced:

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WIP

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TODOs

Fixed (uncommitted 2026-07-09)

Blockers and bummers

Outcome