* fix(compression): compaction follows the ratio again; no default token cap
compression.threshold_tokens defaulted to 256000 since #115986, so every
window above ~341K compacted at 256K regardless of compression.threshold
or model_thresholds: a 1M-window model compacted at 25% of its window,
and threshold: 0.8 still compacted at 256K. No single token count suits
windows from 64K to 1M+, so the cap goes back to opt-in (null) and the
ratio decides, as it did before #115986.
The template seeder and `hermes doctor --fix` copied the 256000 default
into config.yaml, where it reads as a user choice and would keep capping
those installs. Config v47 drops threshold_tokens only when it equals
256000; any other explicit cap and an explicit null are preserved.
The rest of #115986 stays: the model-switch warning quoting the real
trigger and the shared _derive_trigger are correct with any default.
Tests that encoded 256K now derive expectations from DEFAULT_CONFIG.
* docs(compression): threshold_tokens is an optional cap, default null
User guide, developer guide and delegation page described the 256K
default cap; they now describe the ratio trigger as the default and
threshold_tokens as an opt-in cost ceiling.
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