v0.6.7

What's new

• Readable usage page (#35). The usage page now has period tabs, one headline (estimated cost, tokens, cache share) and an aligned table per role and model with cost, share, output and cache %. Large numbers are shortened, and the same model is no longer listed twice when a record has no provider.
• Main-chat images no longer show through the agent view (#36). Pi's overlay compositor skips lines that contain terminal images (earendil-works/pi#6995), so images from the main chat were drawn over the full-screen agent view. While the agent view is open, OptChat now blanks those lines and brings them back when you close it.
• Cheaper parallel compaction (#37). If the memory view is not cached yet, one compactor call goes first and the others wait until it starts answering, so they read the cache instead of each writing it. In a live A/B test, a catch-up batch of 8 calls cost 36% less and a normal-pace replay cost 9% less. Summaries were byte-identical.
• Fewer compactor retries (#38). The compactor still asks for 512 bytes but keeps summaries up to 640 bytes instead of retrying them.

100 tests.