Add --dir flag to fix command

[Copilot]

The fix command lacked a --dir flag to specify custom workflow directories, while the compile command supported it.

Changes

• Added --dir/-d flag to fix command with shell completion support
• Created resolveWorkflowFileInDir() helper function accepting directory parameter; existing resolveWorkflowFile() wraps it for backward compatibility
• Modified getMarkdownWorkflowFiles() to accept optional directory parameter; defaults to .github/workflows when empty
• Updated all callers across codebase to pass empty string for default behavior
• Integrated with compile command's --fix flag to respect directory configuration

Usage

# Fix all workflows in custom directory
gh aw fix --dir custom/workflows --write

# Fix specific workflow in custom directory
gh aw fix my-workflow --dir custom/workflows

# Works with compile command
gh aw compile --fix --dir custom/workflows

The implementation mirrors the compile command's behavior: relative paths only, defaults to .github/workflows, supports both batch and targeted fixes.

Original prompt

the "fix" command should support a --dir flag like the compile command

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