Claude Code v2.1.159 → v2.1.160: `workflow` trigger renamed to `ultracode` + security fixes

[claude-yolo]

WHY you should care

PR: thevibeworks/claude-code-docs#1006

🔥 Breaking: workflow keyword no longer works

Renamed the dynamic-workflow trigger keyword from `workflow` to `ultracode`. The word "workflow" no longer triggers a run; asking for one in your own words still works. The trigger keyword is highlighted in violet in the prompt input.

If you have scripts, prompts, or muscle memory using the word "workflow" to trigger dynamic workflows — it's dead. Use `ultracode` now.

⚠️ Security: shell startup file protection

Now prompts before writing to `.zshenv`, `.zlogin`, `.bash_login` and `~/.config/git/` — prevents unintended command execution from sneaky edits.

Also: `acceptEdits` mode now prompts before writing build-tool configs (`.npmrc`, `.yarnrc`, `bunfig.toml`, etc.)

🚀 Other notable

• Opus 4.8 officially in Managed Agents API (was "NextOpus" placeholder before)
• Background agent reliability: 8+ fixes for session restore, socket issues, freeze on exit
• `grep` now satisfies read-before-edit check (no separate Read needed)
• WSL clipboard fix via PowerShell interop
• `CLAUDE_CODE_OPUS_4_6_FAST_MODE_OVERRIDE` removed (no-op now)

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/cc @lroolle
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