Add attach-file sub-command for Jira file attachments

[Copilot]

Adds capability to attach files to Jira issues via both CLI and MCP server.

Changes

• CLI: New attach-file <issue-key> <file-path> sub-command
• MCP Server: New attach_file tool with issue_key and file_path parameters
• Uses IssueService.PostAttachmentWithContext() from go-jira library
• Cross-platform path handling via filepath.Base()

Usage

# CLI
jira attach-file PROJ-123 /path/to/document.pdf

# MCP (via AI assistant)
"Attach /tmp/logs.txt to issue PROJ-123"

Implementation Notes

• Returns attachment ID on successful upload
• Validates file existence before API call
• Consistent error handling between CLI and MCP interfaces

Original prompt

Add a sub-command to attach a file to a Jira ticket.

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[alexec]

@copilot What happens if the file has already been attached?

[Copilot]

@copilot What happens if the file has already been attached?

The file will be attached again as a new attachment with a unique ID. Jira's standard behavior allows duplicate filenames - each attachment is treated independently even if the filename is the same. This is by design, as the same filename might contain different content or represent different versions over time. Users can manually remove duplicate attachments from the Jira UI if needed.