The eight constants that stay fixed each say why in their own doc: two segment sizes are the granularity a configured retention or budget is reclaimed in, the journal's sync interval holds a ratio to the heap's, the heap buffer is sized against one repository, the evaluation window is paired with the sweep that flushes it, the open-window cap is a backstop whose position is not observable, the queue depth follows from how fast policy drains it, and the blob page size is the lexicon's number. `--help` gains the new sections and the range worth staying inside for every key that has one. Change-Id: I7dad4adf6d6522b0d5835b89bab1a1d587d8d116