fix(public): point llms.txt and offer.md at clean /pricing URL and add Pages index

[nish3451]

Summary

• Replaced pricing.html prose reference in llms.txt and offer.md with the clean https://tinystudio.io/pricing URL. The .html twin is the 307-redirect target the worker redirects to /pricing; teaching engines the redirect target instead of the canonical URL contradicts the sitemap and the Answer Readiness section that already declare the clean path.
• Added a ## Pages section near the top of llms.txt listing every indexable page with a one-line description. llms.txt had no page index, so an engine reading it could discover the offer contract but not the pages themselves. The section follows the llms.txt convention (H2 + bullet list of URLs) and sits before ## Identity so engines find it early.
• No claims changed, no new promises, no forbidden copy. Both files still mirror the same offer contract (check-site.mjs mirror rule passes).

Why this is a traction item

This is backlog item 1105 (GEO/traction): "Point live llms.txt and offer.md buyer URLs at clean non-307 paths." The closed PRs #57 and #142 attempted broader canonical fixes and went CONFLICTING; this PR narrows to the two machine-readable files only, where the pricing.html reference is the last remaining redirect-target hint.

Test plan

• npm run check — TinyStudio.io checks passed
• npm run test:headings — 6/6 pass
• npm run test:sitemap — 7/7 pass
• npm run test:worker — 83/83 pass
• npm run test:contract — 8/8 pass
• npm run test:study — 2/2 pass
• npm run test:viewport — 4/4 pass
• npm run test:ui — pass
• npm run test:narrow-pages — pass
• npm run test:narrow — all viewports PASS
• git diff --check — clean
• Verified pricing.html no longer appears in llms.txt or offer.md prose
• Verified ## Pages section lists all 7 sitemap URLs with clean paths

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📥 Commits

Reviewing files that changed from the base of the PR and between 8919494 and 23e8bf7.

📒 Files selected for processing (2)

• public/llms.txt
• public/offer.md

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