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 — Doug McCLeary (Aledo, IL, 2025)
+
+- **Publisher:** ProHarvest Seeds (cross-vendor plot report)
+- **Crop:** Corn
+- **Year:** 2025
+- **Location:** Aledo, IL · Mercer County
+- **Cooperator:** Doug McCLeary
+- **Company rep:** Ronn Dillavou
+- **Planted:** 4/16/2025
+- **Harvested:** 9/19/2025
+- **Previous crop:** Soybeans
+- **Row width:** 30"
+- **Population:** 34,000 seeds/acre
+- **Tillage:** Conventional
+- **Irrigation:** Non-Irrigated
+- **Source PDF:** https://proharvestseeds.com/wp-content/uploads/2025/10/Corn-McCleary-Aledo-IL.pdf
+
+---
+
+## Results (head-to-head)
+
+| Rank | Brand | Hybrid/Variety | Trait | Yield/Ac | % H2O | Test Wt | +/- Ave |
+|---|---|---|---|---|---|---|---|
+| 1 | DEKALB | DKC112-12RIB | TRE RIB | 276.0 | 19.0 | 63.0 | 14.4 |
+| 2 | DEKALB | DKC66-06RIB | TRE RIB | 272.0 | 17.1 | 61.0 | 10.4 |
+| 3 | DYNA-GRO | D52PN76RA | PCE | 270.0 | 20.3 | 55.0 | 8.4 |
+| 3 | ProHarvest | 83P66 | VT2P VT2P RIB | 270.0 | 19.6 | 58.0 | 8.4 |
+| 5 | ProHarvest | 82P96 | PCE PCE | 269.0 | 20.4 | 55.0 | 7.4 |
+| 6 | BREVANT | B12J58V | VCE | 268.0 | 17.7 | 60.0 | 6.4 |
+| 7 | BREVANT | B11M47PCE | PCE | 267.0 | 17.9 | 61.0 | 5.4 |
+| 7 | DEKALB | DKC114-99RIB | VT4P RIB | 267.0 | 18.2 | 59.0 | 5.4 |
+| 9 | ProHarvest | 78P95 | PCE PCE | 266.0 | 17.4 | 59.0 | 4.4 |
+| 9 | DYNA-GRO | D49PN05 | PCE PCE | 266.0 | 17.5 | 58.0 | 4.4 |
+| 9 | DYNA-GRO | D52VT96RIB | VT2P RIB | 266.0 | 16.8 | 60.0 | 4.4 |
+| 9 | BREVANT | B13C49PCE | PCE | 266.0 | 18.7 | 59.0 | 4.4 |
+| 13 | LG | SEEDS | LG63C32 SSPRIB SSPRO | 265.0 | 17.6 | 61.0 | 3.4 |
+| 14 | STINE | 9754-20 | VT2P VT2P RIB | 264.0 | 19.6 | 56.0 | 2.4 |
+| 15 | BREVANT | B10G53PCE | PCE | 263.0 | 17.2 | 60.0 | 1.4 |
+| 16 | LG | SEEDS | LG62C20 D-RN D | 262.0 | 20.3 | 57.0 | 0.4 |
+| 17 | DEKALB | DKC110-41RIB | TRE RIB | 261.0 | 16.2 | 60.0 | -0.6 |
+| 18 | BREVANT | B12H48PCE | PCE | 260.0 | 17.6 | 54.0 | -1.6 |
+| 19 | DEKALB | DKC114-43RIB | VT2P RIB | 259.0 | 18.4 | 60.0 | -2.6 |
+| 20 | DEKALB | DKC56-26RIB | TRE RIB | 258.0 | 15.0 | 60.0 | -3.6 |
+| 20 | ProHarvest | 81P45 | TRE RIB | 258.0 | 17.4 | 57.0 | -3.6 |
+| 22 | DEKALB | DKC107-69RIB | TRE RIB | 256.0 | 16.4 | 61.0 | -5.6 |
+| 23 | STINE | 9755-20 | VT2P VT2P RIB | 253.0 | 16.2 | 62.0 | -8.6 |
+| 24 | BREVANT | B14C59PCE | PCE | 252.0 | 20.3 | 57.0 | -9.6 |
+| 25 | DEKALB | DKC110-10RIB | SS RIB | 251.0 | 17.0 | 60.0 | -10.6 |
+| 26 | DYNA-GRO | D55TC86RIB | TRE RIB | 250.0 | 17.3 | 63.0 | -11.6 |
+| 27 | STINE | 9753-20 | VT2P VT2P RIB | 228.0 | 17.8 | 61.0 | -33.6 |