There are a few commentaries available for Sri Lalitha Sahasranama, and Bhaskararaya's commentary has been published in English, translated by Sri Anantakrishna Sastri. This is a full commentary and not just word by word meaning.This is what I recommend.
You can order it online if you like. Search for "Bhaskararaya" and "Lalitha Sahasranama" and "...
"chit-agni-kunda sambhootha" does not represent the "spark of thought or imagination", but "one who was born from the altar of the fire of consciousness"
Bhaskararaya in his commentary says on this name, as follows;
Chit, pure Brahman, and he is the altar of fire; for he dispels the
darkness of ignorance (Avidya).
In the stanza, "In the fire of ...