Suppress dynamic tool progress in stderr

[LZong-tw]

Summary

Suppress high-frequency dynamicToolCall progress updates from foreground stderr while retaining them in each job's log file.

Why

The Claude Code host can retain stderr progress as transcript tool output. A task with many dynamic Read/Bash calls can therefore create a very large, repetitive JSONL assistant record and make session resume slow or unusable.

Change

• add hideFromStderr to normalized progress events;
• mark only dynamic tool start/completion progress as hidden from stderr;
• retain every event in the job log and preserve all other foreground progress.

Validation

• npm test
• new regression fixture emits 100 dynamic tool start/completion pairs;
• regression asserts zero such lines on stderr and 100 start + 100 completion entries in the job log.