It is impossible to run the miner without a node (validation, chainstate, mempool, rpc, ...). Also, the module is in the node library. Thus, it should be moved to src/node.
Also, replace the validation.h include in the header with a forward-declaration.
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-BEGIN VERIFY SCRIPT-
# Move module
git mv src/miner.cpp src/node/
git mv src/miner.h src/node/
# Replacements
sed -i 's:miner\.h:node/miner.h:g' $(git grep -l miner)
sed -i 's:miner\.cpp:node/miner.cpp:g' $(git grep -l miner)
sed -i 's:MINER_H:NODE_MINER_H:g' $(git grep -l MINER_H)
-END VERIFY SCRIPT-
Concept ACK
Code-review ACK fa4e09924b11b0dc94e377005f86a83c09761265