Polish landing GEO/SEO: schema, meta, robots & llms.txt

[Santisoutoo]

Addresses the landing GEO/SEO audit checklist in #717 (P1 + P2 + P3). All changes are static markup / text / a public asset — no runtime code.

P1

• Meta description 247 → 153 chars (keeps the "Local-first, Apache 2.0" hook).
• Organization JSON-LD: added author GitHub profiles to sameAs + a knowsAbout topic list.
• WebSite: added a potentialAction SearchAction (entity recognition).
• Title consistency: the prerender overwrites document.title from LandingPage.tsx, so the static <title> now matches the runtime es title (LexFlow — Legislación española, viva y navegable).

P2

• og:image:alt + twitter:image:alt.
• Author Person schema enriched (jobTitle, sameAs, worksFor, knowsAbout) — sourced from the authors' own published bios in landing/src/i18n/…/landing.json.
• robots.txt: allow Amazonbot, FacebookBot, facebookexternalhit, GoogleOther, anthropic-ai; disallow Bytespider.
• llms.txt: blockquote trimmed to ≤200 chars (191), added ## Key Facts + ## Contact, ## Pages now uses canonical [Title](URL): desc.
• og-image.png: 193 KB → 22.6 KB at 1200×630 (256-colour palette + dither). Visually near-identical; only faint banding in the dark gradient, imperceptible at social-preview scale. If you'd rather keep the pristine gradient, revert just this one file — everything else is independent.

P3

• Added llms-full.txt (fuller machine-readable summary).
• Added an IndexNow key file (b4d2eba…​.txt).

Intentionally omitted (no fabrication)

• twitter:site / twitter:creator and author LinkedIn URLs — I don't have the real handles/profiles and won't guess (would risk pointing at the wrong accounts). Add them when known.

Verification

• Full build green: tsc --noEmit ✅, vite build ✅, prerender.mjs ✅ (installed Chromium locally).
• Verified in the prerendered dist/index.html: title matches, description ≤155, og:image:alt/twitter:image:alt, Organization knowsAbout, SearchAction, Person jobTitle all present; both JSON-LD blocks parse as valid JSON.
• Public files (llms.txt, llms-full.txt, IndexNow key, og-image.png) copied into dist/.

Refs #717

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

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Run ID: 47b8045b-c0fc-4944-a3a1-afa3689fe8df

📥 Commits

Reviewing files that changed from the base of the PR and between e5b825c and a2adf36.

⛔ Files ignored due to path filters (1)

• landing/public/og-image.png is excluded by !**/*.png

📒 Files selected for processing (5)

• landing/index.html
• landing/public/b4d2eba75f03616c65e3655fcb43b515.txt
• landing/public/llms-full.txt
• landing/public/llms.txt
• landing/public/robots.txt

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/landing-geo-polish

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