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 — Kevin McMath (Clinton, IL, 2024)
+
+- **Publisher:** ProHarvest Seeds (cross-vendor plot report)
+- **Crop:** Corn
+- **Year:** 2024
+- **Location:** Clinton, IL · Dewitt County
+- **Cooperator:** Kevin McMath
+- **Company rep:** Rick Urish
+- **Planted:** 1/0/1900
+- **Harvested:** 1/0/1900
+- **Row width:** 30"
+- **Source PDF:** https://proharvestseeds.com/wp-content/uploads/2024/11/Corn-Kevin-McMath-Clinton-IL-61727.pdf
+
+---
+
+## Results (head-to-head)
+
+| Rank | Brand | Hybrid/Variety | Trait | Yield/Ac | % H2O | Test Wt | +/- Ave |
+|---|---|---|---|---|---|---|---|
+| 1 | PIONEER | P1742 | PCE PCE | 276.36 | 19.7 | 56.6 | 23.0 |
+| 2 | PRO | HARVEST | 80P75PCE PCE | 279.26 | 16.3 | 56.6 | 26.0 |
+| 3 | PIONEER | P09312V | VCE | 272.82 | 16.7 | 58.0 | 19.5 |
+| 4 | BURRUS | 6U77 | SSP SSPRO | 270.21 | 18.8 | 55.4 | 16.9 |
+| 5 | PRO | HARVEST | 83P48 STAX PRO SS RIB | 265.89 | 20.1 | 58.0 | 12.6 |
+| 6 | BURRUS | 7P71 | VT2P VT2P RIB | 266.54 | 18.4 | 58.8 | 13.2 |
+| 7 | DEKALB | DKC | 68-34 RIB SS RIB | 259.31 | 20.4 | 58.4 | 6.0 |
+| 8 | BURRUS | 6N54 | VT2P VT2P RIB | 261.74 | 19.0 | 58.5 | 8.4 |
+| 9 | DEKALB | DKC110-10RIB110 | SS RIB | 265.3 | 17.9 | 55.8 | 12.0 |
+| 10 | BURRUS | 7F33 | VT2P VT2P RIB | 256.28 | 19.6 | 56.5 | 3.0 |
+| 11 | AGRIGOLD | A643-52VT2RIB | VT2P RIB | 262.62 | 19.6 | 57.8 | 9.3 |
+| 12 | AGRIGOLD | A642-05VT2RIB1 | VT2P RIB | 259.94 | 18.9 | 56.8 | 6.6 |
+| 13 | PIONEER | P14830Q | Qrome | 256.22 | 18.5 | 57.9 | 2.9 |
+| 14 | PRO | HARVEST | 83P66VT2PRO VT2P RIB | 255.83 | 20.4 | 58.2 | 2.5 |
+| 15 | BURRUS | 8M81 | TRE TRE RIB | 241.79 | 20.2 | 56.0 | -11.5 |
+| 16 | AGRIGOLD | 646130 | VT2P RIB | 243.19 | 20.2 | 56.6 | -10.1 |
+| 17 | DEKALB | DKC | 66-18 RIB VT2P RIB | 230.23 | 19.6 | 55.6 | -23.1 |
+| 18 | PIONEER | P13777V | VCE | 233.67 | 18.4 | 57.1 | -19.6 |
+| 19 | PRO | HARVEST | 85P58 STAX SS RIB | 232.76 | 19.7 | 59.2 | -20.6 |
+| 20 | BURRUS | 7L62 | AA AA | 225.69 | 20.7 | 57.6 | -27.6 |