Swap in the new molecular-graph icon across canvas favicon, in-app logo,
and README branding paths. Add HANDOFF.md as the cross-session context
doc carried over from the Starfire→Molecule AI migration. Fix stale
"Starfire" reference in the pre-commit hook header.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
