fix: show both agent icons in exchange headers

[zzxwill]

What changes

Exchange headers now show the matching icon beside both the judge and jury agent names in the console and standalone demo. Previously, the jury agent's icon appeared before the judge's name and the jury agent had no icon beside its own name.

Validation

• npm test: all 193 tests passed.
• npm run test:package: fresh installed-package checks passed.
• All six existing browser tests passed against the freshly installed tarball using system Chrome.
• Reproduced the one-icon header on origin/master and verified two matching, visible icons in both packaged pages at 1100px and 390px.
• Built and installed @agentsdance/codejury@0.8.0 from this branch. Live verification with jury review --dir . --trunk master --jury droid --judge codex --rounds 2 --push=false --web=false completed after one round on commit c57be6a: Droid reported NO NEW FINDINGS; the saved run state is converged.

Limitations

Live review was completed with Droid as reviewer. Claude was unavailable for the initial multi-reviewer attempt. No compatibility changes.