feat: add average-time SEO landing pages for IRONMAN and 70.3

[rootulp]

Summary

P1 of the adoption strategy: two statically-prerendered landing pages targeting evergreen head queries ("average ironman time", "average half ironman time", "average 70.3 time by age group") that nothing else on the web answers with this much data.

• /stats/average-ironman-time and /stats/average-half-ironman-time — shared AverageTimeArticle server component with:
  • Prose intro with computed medians (12:23:19 full / 5:52:28 for 70.3, from 2.1M finisher results)
  • Percentile table ("what is a good time?"), median swim/bike/run splits, finish-time histogram (reuses RaceHistogram)
  • Median finish by age group × gender (standard brackets + Pro; para-support categories filtered), and by year
  • FAQ section with matching FAQPage JSON-LD
  • Cross-links to the sibling page, /courses, and /races
• Data pipeline: scripts/build-search-index.js now also emits data/distance-stats.json.gz (2.8 KB, committed like the other index artifacts) from the same single CSV pass — per-distance percentiles, age-group/gender/year medians, and pre-binned histograms clipped to p0.1–p99.9
• getDistanceStats() in data.ts + DistanceStats types
• Both pages added to the sitemap (priority 0.7) and linked from /stats
• Small fix: not-found.tsx title no longer doubles the | TriTimes suffix introduced by the layout title template

Testing

• npm run test: 157/157 pass; npm run lint: clean
• npm run build: green — both new pages prerender as fully static (no runtime corpus reads)
• Verified locally on next start: unique titles/descriptions/canonicals, FAQPage JSON-LD present, sitemap includes both URLs, tables and histogram render with real data
• Regenerated committed artifacts (athlete-index, course-stats, aggregate-stats) are byte-identical; only distance-stats.json.gz is new

🤖 Generated with Claude Code

https://claude.ai/code/session_01DM6tEZaDCx5PQgaxuV8Fh8

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Generated by Claude Code

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Project	Deployment	Actions	Updated (UTC)
tritimes	Ready	Preview, Comment	Jul 15, 2026 9:13pm

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: f0d619f1-0cb5-4e81-ac0e-5e1189850df1

📥 Commits

Reviewing files that changed from the base of the PR and between a98516e and 50d0bf2.

⛔ Files ignored due to path filters (1)

• data/distance-stats.json.gz is excluded by !**/*.gz

📒 Files selected for processing (9)

• app/src/app/not-found.tsx
• app/src/app/sitemap.ts
• app/src/app/stats/average-half-ironman-time/page.tsx
• app/src/app/stats/average-ironman-time/page.tsx
• app/src/app/stats/page.tsx
• app/src/components/AverageTimeArticle.tsx
• app/src/lib/data.ts
• app/src/lib/types.ts
• scripts/build-search-index.js

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch claude/tritimes-adoption-strategy-eski14

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