feat: add work item attachment tools

[akhil-vamshi-konam]

Description

Add MCP tools for work item attachment CRUD.

Tools added:

• list_work_item_attachments — list attachments with metadata (name, size, content type)
• get_work_item_attachment_download_url — returns presigned S3 URL.
• upload_work_item_attachment_from_url — fetch public URL server-side, upload via 3-step S3 presigned POST flow; includes SSRF protection (blocks private/internal IPs).
• delete_work_item_attachment — delete by attachment ID
• read_work_item_attachment — fetch attachment content for LLM consumption: images (PNG/JPEG/GIF/WEBP ≤5 MB) returned as vision-readable, text files (TXT/MD/CSV/HTML/XML/YAML/JSON
  ≤1 MB) returned as string

Bumps plane-sdk to 0.2.16 which adds upload_from_bytes and get_download_url methods on WorkItemAttachments.

Type of Change

• Feature (non-breaking change which adds functionality)

Test Scenarios

• List attachments on a work item
• Upload file from public URL, verify appears in list
• Get download URL, open in browser / fetch with curl
• Delete attachment, verify removed from list

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 4746eb6d-bc25-47b4-b721-5be4be36812c

📥 Commits

Reviewing files that changed from the base of the PR and between 3d54d1a and acbe8ed.

📒 Files selected for processing (3)

• plane_mcp/tools/__init__.py
• plane_mcp/tools/work_item_attachments.py
• pyproject.toml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat-attachment-tools

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