Add reproducible OpenUI token benchmark article

[nexicturbo]

Summary

• Adds a benchmark-backed article for the token-cost topic with a more reproducible angle than a pure comparison essay.
• Adds benchmarks/token_cost_comparison.py, a small tiktoken harness that compares OpenUI Lang, compact JSON, and an AI SDK-style tool envelope across three equivalent generated UI fixtures.
• Keeps the article intentionally sober: OpenUI saves 27.0% vs the tool envelope in these fixtures and 6.8% vs carefully compacted JSON, then explains why the runtime contract matters beyond headline token savings.

For #4

Benchmark output

| Fixture | OpenUI Lang | Compact JSON | AI SDK-style tool envelope |
| --- | ---: | ---: | ---: |
| Renewal risk review | 114 | 123 | 156 |
| Onboarding checklist | 84 | 82 | 132 |
| Support triage | 102 | 117 | 123 |
| **Total** | **300** | **322** | **411** |

Savings vs compact JSON: 6.8%
Savings vs AI SDK-style envelope: 27.0%

Validation

• python3 benchmarks/token_cost_comparison.py
• python3 -m py_compile benchmarks/token_cost_comparison.py
• git diff --check
• npx --yes markdownlint-cli --disable MD013 -- "Articles/The Token Cost of Beautiful AI - A Reproducible OpenUI Benchmark.md"

AI-assisted drafting and editing were used for this contribution.

[entelligence-ai-pr-reviews]

---

Confidence Score: 5/5 - Safe to Merge

Safe to merge — this PR adds a new article documenting a reproducible OpenUI token benchmark, which is a purely additive content contribution with no logic, runtime, or security implications. The review pipeline found zero issues, no unresolved prior comments exist, and the change introduces no code paths that could affect system behavior. The PR achieves its stated goal of documenting benchmark methodology in a reproducible manner, which is a straightforward and low-risk addition to the content base.

Key Findings:

• No review comments were generated by the automated analysis, indicating no detectable logic, security, or style issues in the new article content.
• The PR is content-only (a benchmark article), meaning there are no runtime code paths, data mutations, or security surfaces introduced.
• Zero pre-existing unresolved comments exist in the review history, so there is no inherited technical debt or outstanding concerns associated with this change.

[nexicturbo]

Follow-up update: added assets/openui-token-benchmark-totals.svg, a compact visual summary of the benchmark totals already produced by benchmarks/token_cost_comparison.py. The chart uses the measured totals from the article: OpenUI Lang 300, compact JSON 322, and AI SDK-style tool envelope 411.

Validation run:

• python3 benchmarks/token_cost_comparison.py
• git diff --check
• npx --yes markdownlint-cli --disable MD013 -- "Articles/The Token Cost of Beautiful AI - A Reproducible OpenUI Benchmark.md"
• xmllint --noout assets/openui-token-benchmark-totals.svg