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 — Gary Houdek (Chapman, NE, 2024)
+
+- **Publisher:** ProHarvest Seeds (cross-vendor plot report)
+- **Crop:** Corn
+- **Year:** 2024
+- **Location:** Chapman, NE · Merrick County
+- **Cooperator:** Gary Houdek
+- **Company rep:** Derald Watson
+- **Planted:** 1/0/1900
+- **Harvested:** 10/2/2024
+- **Previous crop:** Corn
+- **Row width:** 30"
+- **Tillage:** Min-Till
+- **Irrigation:** Irrigated
+- **Fungicide:** Yes
+- **Source PDF:** https://proharvestseeds.com/wp-content/uploads/2024/11/Corn-Gary-Houdek-Chapman-NE-68827.pdf
+
+---
+
+## Results (head-to-head)
+
+| Rank | Brand | Hybrid/Variety | Trait | Yield/Ac | % H2O | Test Wt | +/- Ave |
+|---|---|---|---|---|---|---|---|
+| 1 | Channel | 216-36 | STX SS RIB | 240.73 | 16.6 | 59.2 | 19.1 |
+| 2 | Channel | 216-36STX | SS RIB | 237.35 | 15.7 | 59.1 | 15.7 |
+| 3 | Channel | 216-36STX | SS RIB | 236.36 | 15.8 | 59.5 | 14.7 |
+| 4 | Channel | 214-78 | DGVT2P RIB | 233.61 | 14.5 | 58.8 | 12.0 |
+| 5 | NK | NK1307 | DV | 230.78 | 13.2 | 59.9 | 9.1 |
+| 6 | Brevant | B13K20 | Qrome | 229.66 | 12.9 | 58.5 | 8.0 |
+| 7 | Channel | 211-11 | VT2P RIB | 227.22 | 13.1 | 60.2 | 5.6 |
+| 8 | Becks | 6692 | SXP | 225.74 | 17.6 | 60.1 | 4.1 |
+| 9 | Brevant | B14H38 | AM | 220.57 | 14.1 | 59.9 | -1.1 |
+| 10 | Becks | 6485 | SX | 220.53 | 14.7 | 58.5 | -1.1 |
+| 11 | Channel | 216-36 | STX SS RIB | 219.8 | 17.1 | 59.5 | -1.9 |
+| 12 | Channel | 216-36STX | SS RIB | 219.68 | 16.1 | 59.8 | -2.0 |
+| 13 | ProHarvest | 8360 | VT2P RIB | 218.67 | 14.2 | 58.5 | -3.0 |
+| 14 | Channel | 217-01 | VT2P RIB | 218.53 | 13.0 | 59.7 | -3.1 |
+| 15 | Channel | 214-22 | STX SS RIB | 215.99 | 13.2 | 60.7 | -5.7 |
+| 16 | Prairie | Valley | PV14-D44 TRE RIB | 214.14 | 14.5 | 59.8 | -7.5 |
+| 17 | ProHarvest | 83P48 | SSPRO | 213.47 | 13.5 | 61.2 | -8.2 |
+| 18 | Becks | 6442 | AM | 211.35 | 14.1 | 58.6 | -10.3 |
+| 19 | Channel | 216-36STX | SS RIB | 207.73 | 15.7 | 59.5 | -13.9 |
+| 20 | Becks | 6041 | Qrome | 207.43 | 13.5 | 60.0 | -14.2 |
+| 21 | ProHarvest | 83P17 | PCE | 205.51 | 16.1 | 58.0 | -16.1 |