docs(website): follow-ups spec

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Author: blove

docs/superpowers/specs/2026-08-31-followups-design.md

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+# Design-program follow-ups
+
+**Date:** 2026-08-31 · **Status:** Approved. · **Branch:** `blove/followups`
+
+1. **Showcase intros → rail.** The three CodeShowcase intros (lg/chat/render
+   `*-show-intro`) are the last centered kicker grammar. Each eyebrow wraps
+   in a shared `show-intro-rail` div + aria-hidden hairline; intros
+   left-align. Headings/snippets untouched.
+2. **ProofStrip fourth cell (condition met).** npm @threadplane/langgraph
+   @latest publishes `^20 || ^21 || ^22` (verified 2026-08-31 against the
+   registry) — the shipped homepage spec's revival condition for the cut
+   Angular cell. New cell: value derived from
+   `WEBSITE_SUPPORTED_ANGULAR_MAJORS` (`20–22`, first–last, NOT hardcoded),
+   caption "Angular majors supported, CI-tested", source
+   npmjs.com/package/@threadplane/langgraph. Grid → repeat(4, 1fr); spec
+   3→4 first.
+3. **RecentArticles moves above the dark FinalCTA** so the closer closes.
+4. **Untrack `apps/website/tsconfig.tsbuildinfo`** (gitignored but tracked).