Show clearer next steps after smartassist setup

[jnrahme]

Goal

Improve activation by telling users exactly what to do after smartassist setup succeeds.

Done when

• the CLI prints a short next-step block after setup
• the block points users to one first-value action
• the block points users to feedback and support paths
• output stays concise and fits the current product truth

Good starting files

• smartassist/cli.py
• README.md
• tests/test_cli.py

Verification

• add or update CLI tests if needed
• run python3 -m pytest -q
• manually inspect the output for tone and clarity