bug: bun 1.3.12 bun build --compile produces broken arm64 binaries (exit 137)

[terisuke]

Summary

bun build --compile on bun 1.3.12 (macOS 26.4, Apple Silicon arm64) produces binaries that immediately exit with SIGKILL (exit 137). This affects ALL compiled binaries, not just OpenCode.

Minimal Reproduction

echo 'console.log("hello")' > /tmp/hello.ts
bun build --compile /tmp/hello.ts --outfile /tmp/hello-bin
/tmp/hello-bin  # → exit 137 (killed)

Environment

• bun: 1.3.12 (700fc117a)
• macOS: 26.4 (25E246)
• CPU: Apple Silicon arm64 (Mac16,6)
• Repo expects: bun@1.3.11 (package.json:7)

Evidence

• Crash report: Abort trap: 6 in Io.GenericWriter.typeErasedWriteFn + setTerminalTitle
• Binary is unsigned (codesign: code object is not signed at all) but this is NOT the cause — the OLD working binary (4/10) was also unsigned
• OLD binary (built 2026-04-10 with previous bun version) works fine
• NEW binary (built 2026-04-11 with bun 1.3.12) crashes on both dev branch and feature branches

Impact

• opencode command is broken (workaround: dev wrapper via bun run dev)
• CI builds may also be affected
• Blocks Wave 5 (deploy) of 調査タスクの品質差異: gcloud logging で User-Agent/IP 未分析 & 400エラー未探索 — セッションDB完全解析 #161

Fix

1. Downgrade bun to 1.3.11 and verify binary works
2. If confirmed, pin bun version in CI and local setup
3. Report upstream to bun if this is a bun regression

Workaround

~/.local/bin/opencode replaced with wrapper script that runs bun run dev directly.

Refs: #161

[terisuke]

Workaround applied: bun pinned to 1.3.11 in package.json. bun 1.3.12 arm64 compile regression tracked upstream.