index.html's roadmap grid still shows 3 already-published explainers as "coming soon"

[yakew7]

Where: index.html, the .roadmap-grid section, lines ~3061-3079.

Three roadmap items still carry <div class="roadmap-status soon"></div>:

• "Explainer: Race Correction in Clinical Algorithms" (line ~3061)
• "Explainer: The Obermeyer Case - Cost as a Proxy for Health Need" (line ~3068)
• "Explainer: Underdiagnosis Bias" (line ~3075)

The bug: all three are already published, real explainers - confirmed both explainers/race-correction-clinical-algorithms.md/.html, explainers/obermeyer-cost-proxy.md/.html, and explainers/underdiagnosis-bias.md/.html exist, and all three have real entries in assets/explainers-data.json. They were never flipped from roadmap-status soon to roadmap-status done (the class every genuinely-shipped item above them in the same grid uses) when they actually shipped.

Suggested fix: change all three items' status class from soon to done, matching the pattern of every other completed item in the same .roadmap-grid.

[sushicat75]

On it.