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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+# Corn yield trial — Loker LLC (Parks, NE, 2024)
+
+- **Publisher:** ProHarvest Seeds (cross-vendor plot report)
+- **Crop:** Corn
+- **Year:** 2024
+- **Location:** Parks, NE · Dundy County
+- **Cooperator:** Loker LLC
+- **Company rep:** Derald Watson
+- **Planted:** 5/20/2024
+- **Harvested:** 10/31/2024
+- **Previous crop:** Corn
+- **Row width:** 30"
+- **Population:** 32,000 seeds/acre
+- **Tillage:** No-Till
+- **Irrigation:** Irrigated
+- **Fungicide:** Yes
+- **Source PDF:** https://proharvestseeds.com/wp-content/uploads/2024/11/Corn-Brad-Zach-Loker-Parks-NE-69041.pdf
+
+---
+
+## Results (head-to-head)
+
+| Rank | Brand | Hybrid/Variety | Trait | Yield/Ac | % H2O | Test Wt | +/- Ave |
+|---|---|---|---|---|---|---|---|
+| 1 | Hoegemeyer | 8454 | Qrome | 227.45 | 15.8 | 59.5 | 17.6 |
+| 2 | ProHarvest | 8360 | VT2P RIB | 219.75 | 14.1 | 59.0 | 9.9 |
+| 3 | Pioneer | P12904 | AML | 219.18 | 15.7 | 58.0 | 9.4 |
+| 4 | Pioneer | P13777 | PCE | 216.91 | 15.1 | 60.0 | 7.1 |
+| 5 | Channel | 211-11 | SS RIB | 216.04 | 14.9 | 58.5 | 6.2 |
+| 6 | Hoegemeyer | 8207 | V | 214.64 | 15.7 | 59.0 | 4.8 |
+| 7 | Channel | 211-11 | SS RIB | 213.39 | 14.5 | 60.5 | 3.6 |
+| 8 | Pioneer | PO859 | AM | 212.73 | 14.3 | 58.5 | 2.9 |
+| 9 | Pioneer | P1122 | AML | 212.35 | 15.0 | 59.5 | 2.5 |
+| 10 | ProHarvest | 83P66 | VT2P RIB | 211.34 | 17.1 | 58.0 | 1.5 |
+| 11 | Pioneer | P10625 | PCE | 211.31 | 15.4 | 59.5 | 1.5 |
+| 12 | ProHarvest | 83P33 | DGVT2P RIB | 208.54 | 16.6 | 59.5 | -1.3 |
+| 13 | ProHarvest | 78P23 | PCE | 205.47 | 14.9 | 59.0 | -4.3 |
+| 14 | ProHarvest | 81P20 | PCE | 205.18 | 14.0 | 58.0 | -4.6 |
+| 15 | Hoegemeyer | 8172 | V | 204.59 | 15.1 | 59.5 | -5.2 |
+| 16 | Channel | 211-11 | SS RIB | 204.46 | 14.2 | 59.5 | -5.3 |
+| 17 | Hoegemeyer | 7126 | V | 204.22 | 14.7 | 58.5 | -5.6 |
+| 18 | Hoegemeyer | 8235 | Qrome | 204.16 | 15.6 | 60.5 | -5.6 |
+| 19 | Hoegemeyer | 7977 | V | 203.99 | 14.5 | 58.5 | -5.8 |
+| 20 | Hoegemeyer | 7918 | V | 202.72 | 14.1 | 58.5 | -7.1 |
+| 21 | Hoegemeyer | 8054 | V | 199.7 | 14.8 | 59.5 | -10.1 |
+| 22 | ProHarvest | 75P85 | DGVT2P RIB | 197.65 | 14.3 | 58.0 | -12.2 |