fix: Remove duplicate options in specify.md

[ryo8000]

Description

• The scripts frontmatter in specify.md included --json / -Json flags directly in the script path assignment (e.g., scripts/bash/create-new-feature.sh --json "{ARGS}").
• This caused the flag to appear twice when an agent ran the script — once baked into {SCRIPT} and again in the usage examples within the command body (e.g., {SCRIPT} --json --number 5 ...), producing commands like create-new-feature.sh --json "$ARGUMENTS" --json --number 5 ....
• The fix removes --json / -Json from the scripts frontmatter, so {SCRIPT} resolves to just the script path.

Testing

• Tested locally with uv run specify --help
• Ran existing tests with uv sync && uv run pytest
• Tested with a sample project (if applicable)

AI Disclosure

• I did not use AI assistance for this contribution
• I did use AI assistance (describe below)

[Copilot]

Pull request overview

Removes duplicated --json / -Json options from the specify.md frontmatter script definitions so that usage examples don’t result in repeated flags when {SCRIPT} is expanded/executed.

Changes:

• Update the scripts frontmatter entries to contain only the script path plus "{ARGS}", removing baked-in JSON flags.

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