fix(terminalbench): stabilize background processes and simplify env loading

[Octane0411]

Summary

• make background Bash(run_in_background=true) processes survive CLI exit by using detached execution with file-backed stdout/stderr capture
• keep BashOutput and KillBash compatible with detached process groups
• avoid double-backgrounding by normalizing trailing & when run_in_background=true
• force Harbor terminal-bench adapter to pass --cleanup-background never
• simplify local env workflow back to a single .env source and remove profile scaffolding
• update terminal-bench runbook with key/base_url sanity checks

Why

• intermittent configure-git-webserver verifier failures (HTTP 000) were caused by background web services dying after parent process exit
• env profile migration created a split workflow and frequent missing-key runs; this change restores one clear path

Validation

• bun test packages/core/tests/tools/bash-enhanced.test.ts packages/core/tests/tools/bash-output.test.ts packages/core/tests/tools/kill-bash.test.ts
• cd packages/core && bunx tsc --noEmit

Notes

• local unrelated changes in packages/docs/public/icons/* were not included in this PR

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Project	Deployment	Actions	Updated (UTC)
open-agent-sdk	Ready	Preview, Comment	Mar 3, 2026 8:19am