[FEATURE] Support prompt with `-` prefix

Preflight Checklist

• [x] I have searched existing requests and this feature hasn't been requested yet
• [x] This is a single feature request (not multiple features)

Problem Statement

~/ claude --verbose --print 'You are Claude, please say hello to me'
Hello! How can I help you today?
~/ claude --verbose --print '- You are Claude, please say hello to me'
error: unknown option '- You are Claude, please say hello to me'

Why we need allow prompt with - prefix? See terminal-bench-2/pytorch-model-recovery/instruction.md. The instruction start with -.

Proposed Solution

claude --verbose --print --prompt='- You are Claude, please say hello to me'

Alternative Solutions

_No response_

Priority

Critical - Blocking my work

Feature Category

CLI commands and flags

Use Case Example

_No response_

Additional Context

We can't change it to

echo '- You are Claude, please say hello to me' | claude --verbose --print

Because this will improve the terminal bench score.

For example:

claude --verbose --print 'Configure a git server so, ....'

If the model run BASH tool with pkill git, it may kill theclaude --verbose --print 'Configure a git server so, ....' process. This is a bad pattern in the model, and it should have received a score of 0. If we change it into echo with pipe, then pkill git will not kill the claude process. This is a breaking change for agent benchmark.