feat(openspec): propose Blog MVP (internal + Substack cross-post)

openspec/changes/2025-11-17-blog-mvp/proposal.md

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+# Proposal: Blog MVP (Internal + Substack Cross‑Posting)
+
+Status: draft
+Authors: Content Team
+Owners: Content Lead, Web Lead
+Created: 2025-11-17
+Scope: spec
+Related: openspec/specs/feature-blog.md
+
+Summary
+- Build a native blog with editor, tags, scheduling, members‑only posts, RSS/Atom, and optional Substack cross‑posting with canonical link sync.
+
+Motivation
+- Provide an accessible, SEO‑friendly blog with members‑only capability while leveraging Substack reach when desired.
+
+Requirements
+- Accessibility: accessible editor UI, semantic output, keyboard/focus, reduced motion.
+- SEO: canonical URLs, Open Graph/Twitter cards, sitemaps, RSS/Atom.
+- Cross‑post: publish to Substack, sync canonical link/excerpt; import back if edited.
+
+API
+- Posts CRUD; media; tags; cross‑post webhooks.
+
+Test Plan
+- Axe checks on output; server‑side rendering tests; cross‑post integration tests.
+
+Rollout
+- Feature flag; migrate selected posts from Wix; redirects.
+
+Acceptance Criteria
+- Editor accessibility verified; SEO outputs validated; cross‑post round‑trip confirmed.
+
+Slash Commands
+- `/review areas=web,accessibility,security`
+- `/apply spec=openspec/specs/feature-blog.md`
+- `/archive link=<PR>`
+