[BUG] Bun Bus error crash on macOS Silicon when pasting image (chat:imagePaste)

Description

Claude Code crashes with a Bun Bus error when using the chat:imagePaste action (pasting an image from clipboard). This is a hard runtime crash, not a silent failure — Bun panics and the entire session terminates.

Environment

• Claude Code version: 2.1.87
• Bun version (bundled): 1.3.11 (759ce802)
• OS: macOS 26.3 (Darwin 25.3.0)
• Platform: macOS Silicon (Apple M4 Pro)
• RAM: 48GB

Crash Details

Bus error at address 0xBAD4007
Bun v1.3.11 (759ce802) macOS Silicon

Args: "claude" "--dangerously-skip-permissions" "--verbose" "--dangerously-skip-permissions" "--verbose"
Features: Bun.stderr(2) Bun.stdin(2) Bun.stdout(2) abort_signal(16) fetch(14) jsc spawn(28) standalone_executable process_dlopen yaml_parse(222)
Builtins: "bun:main" "node:assert" "node:async_hooks" "node:buffer" "node:child_process" "node:constants" "node:crypto" "node:dns" "node:events" "node:fs" "node:fs/promises" "node:http" "node:https" "node:module" "node:net" "node:os" "node:path" "node:path/posix" "node:path/win32" "node:perf_hooks" "node:process" "node:stream" "node:stream/consumers" "node:timers/promises" "node:tls" "node:tty" "node:url" "node:util" "node:zlib" "ws" "node:http2"
Elapsed: 90411ms | User: 3431ms | Sys: 1046ms
RSS: 0.89GB | Peak: 0.89GB | Commit: 0.90GB | Faults: 72 | Machine: 51.54GB

panic(main thread): Bus error at address 0xBAD4007
oh no: Bun has crashed. This indicates a bug in Bun, not your code.

Bun Crash Report Link

https://bun.report/1.3.11/M_1759ce80mgkgEuhogC________ur1kJ_m45jmDuri6lD+/0w2Cmsz96C27usH__uri6lD+348uCmnu1zCA4Augg11L

Steps to Reproduce

1. Launch Claude Code on macOS Silicon: claude --dangerously-skip-permissions --verbose
2. Use the chat:imagePaste action (Cmd+V with an image in clipboard)
3. Bun crashes with Bus error

Notes

• The crash happens early in the session (~90 seconds elapsed), so this is not a long-session memory issue
• The address 0xBAD4007 looks like a sentinel/poison value, suggesting use-after-free or accessing freed memory during image buffer processing
• Memory usage at crash was modest (0.89GB RSS)
• Related to #22632 (Bun crash during sessions) but with a specific, reproducible trigger (image paste) and different crash signature (Bus error vs segfault)
• Several open issues report image paste not working (#39761, #26901, #29776) but none report it causing a full Bun panic

Expected Behavior

Image paste should either work or fail gracefully with an error message, not crash the runtime.