[iamtoruk]

Summary

• Codex now moves cold rollouts to rollout-*.jsonl.zst, which CodeBurn skipped, so most Codex history disappeared from reports. Every Codex reader (discovery, parser, fork lookup, codex-tps, context view) now decodes them.
• A session present in both forms counts once, from the plain file. Compressed files are parsed whole and never resumed by byte offset.
• On Node below 22.15 (no node:zlib zstd), compressed rollouts are skipped with one notice. Results there match current main.
• DAILY_CACHE_VERSION goes to 76 so settled days pick up the recovered usage.

Testing / Verification

• I have tested this locally against real data (not just unit tests)
• npm test passes
• npm run build succeeds
• Not a UI change

Real ~/.codex with 1,436 compressed and 6 plain rollouts, 2026-01-01 to 2026-10-21:

	Sessions	Calls	Cost
main	3	54	$0.16
this branch	1,358	51,564	$4,842.39

• The same files decompressed and read by main give an identical export in every section.
• With zstd hidden from node:zlib, the export matches main exactly and prints the notice once.
• A daily cache written after compression goes from $0.16 to $4,842.38 on the first run. A cache written before compression keeps its totals, with 0 days changed.