Slimmed after review: the 200K default is dropped. Children compact at the same
0.50 x window ratio trigger as their parent (500K on a 1M model). Reasons:
- the run this came from happened at 0.85 (850K); main was already at 0.50, so
the real delta against main was 500K -> 200K, not 850K -> 200K;
- a replay of the run's 22,489 logged calls (evals/postmortem, cap sweep) put
200K-400K caps within 5% of each other in cost once cache prefixes are intact,
because the write price dominates and the cap only trims read volume;
- every compaction is a chance to lose detail, and the accuracy side was never
measured; at 500K a 1M child compacts roughly never.
What stays: the reviewer's finding that the value was coerced, not validated
(YAML true -> int 1 -> a one-token trigger; "200k" -> silently off). Values are
validated: int >= 16000 enables the cap, 0/false/null/unset = off, anything else
is warned and ignored. Docs and config comment restated accordingly.
Teknium
dcdbc0093d