Add ProHarvest Seeds: 119 varieties + 161 cross-vendor plot reports

ProHarvest Seeds (independent Corn Belt brand, proharvestseeds.com) exposes a public, no-auth WordPress REST API — cleaner ingestion than the HTML-only independents. Two new sources: - `proharvest` (variety identity, 119 row-crop varieties: 70 corn / 47 soy / 2 wheat). Enumerated via /wp/v2/seed (seed-type taxonomy), agronomics parsed from each /seed/<slug>/ detail page into structured characteristics_groups so the ratings actually embed. Mixed scale: disease 1-9 numeric (9=best, no flip), agronomic/general qualitative, soil HR/R. - `proharvest_plots` (trials, data_type=trial, 161 plots, 2024+2025). Per- cooperator harvest reports via the custom /wp-json/proharvest/v1/plots?y= endpoint + PDF table extraction. Many are cross-vendor head-to-head (ProHarvest/Apex vs Pioneer/DEKALB/Becks/Channel/Wyffels). Handles ruled tables, unruled tables (text fallback; soy drops the Test-Wt column → 4 vs 5 numerics), and off-template third-party reports (sanity-gated to verbatim so junk rows never ship). Image-only PDFs skipped + counted. - rag/chunk.py: route proharvest_plots through the shared cross-vendor plot renderer (structured) / verbatim body (raw_text fallback). - sources.json + lessons.md (rating-scales, trial-data). - README/CLAUDE.md corpus inventory brought current (it had drifted: bayer 931 not 475; ebberts/lg/agrigold were unlisted). New totals: 1,645 variety + 6,787 trial records. robots.txt permissive (only search + /dealer-* disallowed); no ToS automation clause. CI rebuilds the index from the committed corpus.
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+# Soybean yield trial — Joliet Junior College Soybeans (Joliet, IL, 2025)
+
+- **Publisher:** ProHarvest Seeds (cross-vendor plot report)
+- **Crop:** Soybean
+- **Year:** 2025
+- **Location:** Joliet, IL · Will County
+- **Source PDF:** https://proharvestseeds.com/wp-content/uploads/2025/10/Soy-JJC-Joliet-IL.pdf
+
+---
+
+## Trial data (verbatim from PDF)
+
+```
+2025 Soybean Variety Plot
+J.F. Richards Land Laboratory
+Cooperator Joliet Junior College Planting Date 14-May
+Address 1215 Houbolt Road; Joliet, IL 60431 Harvest Date 2-Oct
+Coodinates 41.49841° N, 88.16956° W
+County Will
+Crop Soybeans; 30" rows
+Planting Rate 145,000
+Previous Crop Corn
+Tillage System spring disk/spring cultivate
+Plot width 20'
+Plot length 270'
+Formula: Bu/A = A ÷ B ÷ C Herbicide Enlist One + Liberty
+A = [(100 - measured % moisture) * 0.01 ] x harvest weight Additional N / Fungicide n/a
+B = [(1-0.130) x 60 lb/bu] C = [(plot width) x (plot length)/43,560ft²/A]
+Harvest Harvest Bu/Acre @
+Entry Brand Variety Traits RM Rank
+Weight Moisture % 13% moisture
+check₁ Channel CT2725 Enlist 3 2.7 313 8.4 44.3 2
+2 DonMario 2729E Enlist 3 2.7 309 8.4 43.8 3
+3 ProHarvest AE2860 Enlist 3 2.8 330 8.3 46.7 1
+check₂ Channel CT2725 Enlist 3 2.7 309 8.2 43.8 3
+5 Mershman 2526E Osage Enlist 3 2.6 283 8.4 40.2 4
+6 Alloy A29E35 Enlist 3 2.9 258 8.5 36.5 7
+7 Golden Harvest GH2674E3 Enlist 3 2.6 258 8.3 36.6 6
+checkᵌ Channel CT2725 Enlist 3 2.7 263 9.0 37.0 5
+PLOT AVERAGE: 41.1
+```