feat: Update purchasing agent to support RFQs

[jeebeez]

What does this PR do?

• update purchasing agent to support RFQs
• add tool calls to facilitate that

Mandatory Tasks (DO NOT REMOVE)

• I have self-reviewed the code (A decent size PR without self-review might be rejected).
• I confirm automated tests are in place that prove my fix is effective or that my feature works.

How should this be tested?

• Try creating quotes for multiple suppliers from chat

Checklist

• I haven't read the contributing guide
• My code doesn't follow the style guidelines of this project
• I haven't commented my code, particularly in hard-to-understand areas
• I haven't checked if my changes generate no new warnings

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Project	Deployment	Actions	Updated (UTC)
carbon	Error		Mar 5, 2026 1:34pm

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