pi-fold 4.2.8

pi-fold 4.2.8

Patch release.

• Peek omits assistant thinking blocks and their opaque signatures before serialization and pagination, after verifying the original source. Visible text, tool calls and tool results remain unchanged. Pi's saved transcript and exact expand/recovery remain intact.
• Peek results identify the history view and report how many thinking blocks were omitted. Tool guidance and documentation describe the behavior and Anthropic compatibility limits.

Thanks to @kvyb for the detailed report in #10. This removes a confirmed source of thinking replay as ordinary tool-result text. The reported Claude Opus 5.5 refusal through 9router has not been reproduced against a provider; #10 remains open for confirmation on the affected route.

Validation: lint, 82 runtime gates with 9,794 assertions, 118 experiment gates, and six disposable offline SDK scenarios on Pi 1.0.0 and 1.0.4 covering simulated refusals, retries, durable reads and reload. No private live sessions or paid provider calls. Genuine benchmark re-extraction preserves every finding and all 102 evidence rows.