fix(cli): left-align banner hero art

[ggascoigne]

Summary

• left-align the banner's left column so Rich does not inject extra centering spaces around hero art
• add a regression test that asserts hero lines render without center padding

Test Plan

• source venv/bin/activate && pytest tests/hermes_cli/test_banner.py -q

Closes #9879

[teknium1]

Thanks for the focused regression fix. Current upstream main still defines the left banner grid column with justify="center" at hermes_cli/banner.py:639, then renders the configured banner_hero into that left column at hermes_cli/banner.py:648-656. The proposed one-line alignment change directly addresses that live path, and the added test targets the reported braille-padding behavior.

GitHub currently reports this branch as CONFLICTING, so a maintainer salvage will require conflict resolution against current main; no functional problem was found in the patch itself.

Automated hermes-sweeper review.

[teknium1]

Salvaged onto current main as #109135 with your commit authorship preserved where the diff still applied (the file moved/was restructured since April, so some of it is a hand-port with credit in the commit message). Once #109135 merges this PR will be closed with a link to the landed SHA. Thanks for the fix.

[teknium1]

Landed via #109135 (merge 1dce69b) with your commit cherry-picked so authorship is preserved — thank you @ggascoigne. Closing this PR as superseded by the merged salvage; the fix is on main now.