fix(build): restore the lightning-kmp-app pin a merge regressed
`claude/focused-brattain-433b3b` was bootstrapped with the submodule at `84cc44c8`
and never moved it, so every `git add -A` in that worktree staged the older gitlink
over whatever `mantra` had reached. The fast-forward just carried that back here,
undoing three commits of the library: the merged threshold fix, secp256k1-kmp's linux
cinterop sync fix, and the advance that went with them.
`e0d2b823` is what `mantra` pinned at 2f542408 and what this checkout has had checked
out all along -- which is why the submodule showed as modified the moment the
fast-forward landed, and is the only reason this was noticed at all.
A worktree whose submodule is behind will do this again on its next `git add -A`. See
docs: after a merge that moves the pin, move the submodule too.
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