GET /story now sends a weak ETag (server start, transcript size and mtime, turn)
with Cache-Control: no-cache, and answers 304 before building anything when the
transcript has not changed, so a live view's polls cost a stat.
A turn can be bigger than the 8 MB tail on its own (tool results carry whole
files, ~60 KB per result line on large local transcripts), which cut its first
panels. When the window holds no prompt, the reader re-reads a 24 MB, then a
64 MB tail.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>