Refresh portfolio leadership positioning and improve thumbnail rendering

[ryanbaumann]

Motivation

• Recenter the portfolio copy to foreground product, go-to-market, and engineering leadership with explicit team scale and manager-layer scope.
• Make it obvious that work is led by multi-discipline teams (20+ people) and surface those team/system lessons up front.
• Improve visual trust and stability of list and card thumbnails by preferring honest checked-in previews or artifact cards instead of fabricating screenshots.

Description

• Updated site positioning and header copy in portfolio/content/site.json to emphasize product/GTM/engineering leadership, a 20+ person Developer Experience org, adjusted headline, intro, aboutTeaser, proofPoints, and answerEngineSummary.
• Tightened the About page in portfolio/content/pages/about.md to surface team leadership, manager scope, and product go-to-market framing.
• Reordered and retitled several content entries (work, talks, writing) and adjusted role, order, and summary front matter so the homepage reads as a product/GTM system (not just a list of artifacts).
• Emit real image dimensions at build time and use them in thumbnails by updating portfolio/build.mjs to compute imageSize via getImageDimensions and inject width/height on work cards and row thumbnails.
• Improve row/card layout and responsive thumbnail sizing by adjusting .row to a grid layout and tightening .row-thumb sizing in portfolio/style.css.
• Clarified imageAlt copy for entries where external preview fetches were blocked and documented the blocked fetch fallback to artifact cards.
• Added changelog entry describing the positioning and preview audit and minor copy polish across talks/writing entries.

Testing

• ✅ node portfolio/build.mjs succeeded and reported metadata validation passed for built pages.
• ✅ npm run build && npm run smoke (build-local + smoke) completed with all smoke checks passing (17 passed, 0 failed).
• ✅ The staged multi-app build completed and apps were placed under apps/ as expected.
• ⚠️ Playwright screenshot step could not complete in this environment because the Playwright browser binary is not installed and external thumbnail fetch attempts returned 403/proxy blocks, so external-preview retrieval was documented and handled by using checked-in assets or artifact cards instead.

---

Codex Task