Fix X timeline pagination minimum

[splits-gerard]

Summary

• enforce X's max_results=5 minimum for user timeline pagination
• keep returning only the caller-requested number of posts
• cover both one-post limits and a 59+1 paginated result

Tests

$ uvx ruff format --check tools/comms/twitter/client.py tools/comms/twitter/test_client.py
2 files already formatted

$ uvx ruff check tools/comms/twitter/client.py tools/comms/twitter/test_client.py
All checks passed!

$ uv run --no-project --with pytest --with httpx --with python-dotenv --with typer --with rich pytest tools/comms/twitter -q
..................                                                       [100%]
18 passed in 0.22s

The deployed CLI still reproduces the pre-fix failure for twitter timeline zherring --limit 60 --json: its second request sends max_results=1, and X rejects it because the allowed range is 5–100. Post-fix live verification requires deployment of this change.

Requested from Discord thread.

Prompted by: abram