[Feature]: Support PDF resume input in Job Hunter template agent

[Ttian18]

Summary

The Job Hunter template agent (examples/templates/job_hunter/) only accepts resumes as pasted text. Users expect to be able to provide a PDF resume, which is the most common resume format.

The pdf_read tool already exists in the MCP server and can extract text from local file paths or URLs — it just needs to be wired into the agent.

Context

• The chat UI currently only supports image uploads (accept="image/*", shipped in PR feat: image capabilities — upload, screenshot passthrough, vision detection & fallback, aria refs #6682). Platform-level document upload support is on the roadmap ("headless backend attachment interface") but not yet available.
• This is a practical workaround: let users provide a file path to their PDF, and the agent uses pdf_read to extract the text.

Scope

1. Intake node — Add pdf_read to the tools list
2. Intake prompt — Update to tell users they can either paste their resume or provide a path to a PDF file
3. Intake logic — When a user provides a file path, call pdf_read to extract the text before proceeding with analysis

Acceptance Criteria

• pdf_read is listed in the intake node's tools
• Intake prompt offers both options: paste text or provide PDF file path
• Agent correctly calls pdf_read and extracts resume text when given a file path
• Existing paste-text flow still works

Relevant Files

• examples/templates/job_hunter/agent.json (intake node definition)
• examples/templates/job_hunter/nodes/__init__.py (intake node spec)
• tools/src/aden_tools/tools/pdf_read_tool/pdf_read_tool.py (existing tool)

[Ttian18]

I'd like to work on this — the fix is straightforward since pdf_read already exists. Please assign it to me.