fix(cli): avoid initializing the store for read-only commands

[atharva-patill]

Before

ctx locate created work.sqlite even though the store wasn't initialized.

After

ctx locate now reports that the store isn't initialized and no work.sqlite is created.

Reproduction

tmp=$(mktemp -d)

CTX_ANALYTICS_OFF=1 \
CTX_DATA_ROOT="$tmp/data" \
./target/debug/ctx locate event deadbeef

find "$tmp" -maxdepth 2 -type f | sort

Before this change, work.sqlite was created even though the command was read-only.

After this change, the command reports that the store is not initialized and no database is created.