Pure rename ahead of the dump worker's evolution into a bookmark cache
(goal 1c), so history follows the files. The diigo-login helper script
is dropped: the cookie now enters through webapp's mint form, never a
local script.
fixup: scrub failed API-key ping from checklist
diigo-ping never authenticated (Diigo 401); the working path is the
session-cookie dump worker. Renumber steps, note the scrub with the
reason, and drop the ping how-to.
Generated-by: opencode (GLM)