marketing: add Research & Engineering blog

[SignalLayerLabs]

Summary

Adds a first-class Research & Engineering publication surface to MARGINAL.

Published articles

• Detecting No-Progress in AI Agents Without Reading Prompts
• Why an AI Agent Governor Should Start Powerless

Discovery

• /blog/ editorial hub
• Atom feed
• homepage Blog navigation
• homepage article discovery
• reciprocal links from Guides and Reach pages
• sitemap coverage with publication lastmod

Search implementation

• unique descriptive titles and meta descriptions
• self-referencing canonicals
• index/follow + large image previews
• static crawlable article content
• BlogPosting structured data
• BreadcrumbList structured data
• Open Graph / Twitter article metadata
• visible author, publication date and editorial method
• dedicated 1:1, 4:3 and 16:9 article images
• internal topic-cluster linking
• no keyword-variant page farming
• no FAQ structured-data spam
• no fake freshness

Claim discipline

• no universal token-savings claim
• historical 24.93% observation remains explicitly non-causal
• Codex remains Tool Enforcement, not Full Compute Enforcement
• Claude Code/OpenCode capabilities are not broadened
• pseudonymization is not presented as anonymization
• fail-open is contextual to no-progress efficiency governance, not a universal security rule

Funnel

Search / AI discovery
→ technical article
→ Reach guide / related research
→ interactive demo
→ GitHub
→ star / issue / fork

Validation

• Research & Engineering verifier — PASS
• ruff format --check . — PASS
• ruff check . — PASS
• mypy src/marginal — PASS
• pytest -q — PASS
• python3 scripts/build_codex_plugin.py --check — PASS
• python3 -m build — PASS
• python3 -m twine check dist/* — PASS