Compression is where most of the damage happens. Summarize the wrong thing and you have not saved space, you have deleted the answer.
Sort your context into three piles. Keep exact is for anything whose wording carries meaning: numbers, names, stated rules, direct quotes from a source. Summarize is for material where the gist is enough, like a long back-and-forth that settled on a decision. Drop is for anything that is redundant, stale, or was never load-bearing in the first place.
The reason to make the piles explicit is that the easy default is to summarize everything by length. That treats a page of legal terms the same as a page of small talk, and it is the terms that come back to bite you. Length is a poor signal for importance.
When you are unsure which pile something belongs in, ask whether a wrong recollection of it would produce a wrong answer. If yes, keep it exact. If a fuzzy version is fine, summarize. If nothing changes either way, drop it and reclaim the room.