feat: add option to pass user email and display caipe version

[suwhang-cisco]

Hey, I just made a Pull Request!

1. Add new agentForge option to make agent append user email using a new variable:

# app-config.yaml
agentForge:
    userEmailMode: "message" # Options: 'none' (don't include), 'message' (prepend to text), 'metadata' (add as metadata)

three options:
1. "none" (default) - no user email. old method
2. "message" - appends "The user email is XXX" as the prefix of every user message
3. "metadata" - adds a new metadata field in the message json parts

2. Add a new "CAIPE VERSION" display on the UI

• A changeset describing the change and affected packages. (more info)
• Added or updated documentation
• Tests for new functionality and regression tests for bug fixes
• Screenshots attached (for UI changes)
• All your commits have a Signed-off-by line in the message. (more info)