Sessions hang during complex pipeline builds - unresponsive with '>' prompt

Description

Multiple Claude Code sessions become completely unresponsive during or after running complex build pipelines involving file transformations (Marp HTML to PPTX conversion, QA validation, image processing).

When a session hangs:

1. New request is submitted
2. Request appears above text entry with '>' prefix indicator
3. No processing occurs - complete silence
4. Terminal must be force-killed to recover

Context: What I Was Doing

Running a build pipeline that involves:

• Marp markdown → HTML conversion
• HTML to PPTX transformation (html2pptx script)
• QA tile generation and validation
• Image path processing and rewriting
• Multiple sequential scripts in a master build script
• Working across multiple directories/sessions simultaneously

Session IDs affected: 8fa9ceae, c50fb5c4, 8a3977aa, 42a126ac, 1f97787d

System Information

• Claude Code Version: 2.0.60
• OS: macOS (Darwin 25.1.0)
• Frequency: Multiple occurrences Dec 6-7, 2025

Debug Log Findings

TypeErrors: (I.default||I) is not a function (Dec 6 21:44)
EISDIR: illegal operation on a directory, read (Dec 6 22:07)
Lock acquisition failures: /Users/clintgossett/.local/share/claude/versions/2.0.60

Reproduction Context

The hangs occur after:

• Running complex build scripts with multiple sequential operations
• Heavy file I/O and transformations
• Extended session duration with multiple tool invocations
• Jumping between multiple concurrent sessions

Expected Behavior

• Request should execute or return an error
• Session should remain responsive
• Should be able to ctrl+c to cancel a stuck request

Actual Behavior

• Complete unresponsiveness
• No error message or indication
• Terminal must be killed