Add university-extension variety trials: Illinois VT + Iowa ICPT + Ohio OCPT (+123 trial docs)

Independent third-party performance data — land-grant programs that test every entered brand side-by-side with replication + LSD stats. This is the legitimate way to get Pioneer / DEKALB / Brevant / Channel performance the corpus can't scrape directly (data_type=trial, results[] shape; falls through the trial chunker). - illinois_vt_trials (30 docs, 1,392 rows) — U of Illinois VT. Per-region XLSX (openpyxl), corn + soy + WHEAT, 2024+2025. Rich per-site agronomic metadata; corn-following-corn vs -soybean kept distinct. - iowa_icpt_trials (24 docs, 674 rows) — Iowa State ICPT. ASP.NET GridView (viewstate postback for year/district), corn + soy by district x season. - ohio_ocpt_trials (69 docs, 4,647 rows) — OSU/CFAES OCPT. Report PDF (pdfplumber; per-site column groups split by header Yield-token count + x-coord footnote bucketing), corn + soy per site, 2024+2025. 91 distinct seed brands across the three; majors confirmed present in the independent rankings: DEKALB 395, Golden Harvest 249, Channel 241, NK 212, Xitavo 135, LG 103, Pioneer 88, Asgrow 59. (A brand only appears where it ENTERED a given program — e.g. Brevant not in Iowa, DEKALB/Channel not in Illinois — true negatives, not parse gaps.) - rag/chunk.py: gated `include_region` on _render_gh_plot_chunk; the 3 university sources route through it so the region/district is in the embedded chunk + labeled "variety trial (cross-vendor, independent third-party)". Existing plot sources (gh/lg/agrigold/proharvest) unchanged. - requirements.txt: openpyxl (Illinois XLSX; scrape-time only). - sources.json + README/CLAUDE/lessons: registered + attributed; lessons trial-data + Pioneer entries updated (Pioneer/DEKALB performance now available indirectly via these trials). Validation: all 123 chunk via rag.chunk.chunks_from_trial (0 errors), 0 out-of-range yields, 0 dup keys. Public land-grant data; attribution recorded in each tos_note. CI rebuilds the index from the committed corpus.
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+# Corn yield trial — University of Illinois VT, Region 2, IL 2024
+
+- **Publisher:** University of Illinois Variety Testing (independent cross-vendor trial)
+- **Crop:** Corn
+- **State:** IL
+- **Year:** 2024
+- **Region:** Region 2
+- **Rotation:** corn following soybean
+- **Cooperator / host:** Greg Steckel
+- **County:** Warren
+- **Sites:** Monmouth, Goodfield
+- **Soil type:** Sabble silty clay loam
+- **Tillage:** Field cultivate
+- **Planted:** 2024-04-25
+- **Harvested:** 2024-09-25
+- **Source XLSX:** https://vt.cropsci.illinois.edu/wp-content/uploads/2024/11/Region-2-Corn-Table-2024.xlsx
+- **Index page:** https://vt.cropsci.illinois.edu/corn/
+
+---
+
+## Results (ranked by regional yield)
+
+| Rank | Brand | Product | Traits | Yield | Moisture | Lodging | Maturity |
+|---|---|---|---|---|---|---|---|
+| 1 | NuTech | 68C1V | GT:C3R3L HT:B IST:M | 294.4262 | 17.17 | 0.165 | 108 |
+| 2 | Burrus | 4W42 PCE | GT:C3 HT:B IST:M | 287.172 | 17.07 | 0.165 | 108 |
+| 3 | Prairie | 7445 | - | 284.8074 | 20.18 | 0.165 | 112 |
+| 4 | Cornelius | C7366DGDP | GT:CL HT:G IST:L | 282.6678 | 21.41 | 0 | 113 |
+| 5 | Renk | RK825VT4P | GT:C2R2 HT:G IST:M | 280.8785 | 20.01 | 0.165 | 112 |
+| 6 | Cornelius | C7235PCE | GT:C3L HT:B IST:L | 279.7008 | 19 | 0.335 | 112 |
+| 7 | Cornelius | C7026PCE | GT:C3L HT:B IST:M | 278.2172 | 19.02 | 0 | 110 |
+| 8 | Cornelius | C7216VT4P | GT:C2R2L HT:G IST:M | 277.7678 | 20.89 | 0.165 | 112 |
+| 9 | NK | 1480 | GT:C2R2L HT:B IST:L | 276.7029 | 20.34 | 0.5 | 114 |
+| 10 | NuTech | 70F6V | GT:C3R3L HT:B IST:M | 274.9466 | 16.68 | 0 | 110 |
+| 11 | Sun Prairie Seeds | SPX4717 SSP | GT:C2R3L HT:B IST:M | 270.0491 | 18.84 | 0 | 113 |
+| 12 | Sun Prairie Seeds | SP2409 VT4P | GT:C2R2 HT:G IST:M | 269.6173 | 16.64 | 0.665 | 107 |
+| 13 | Viking | Blue River | 76-11 | - | 268.6873 | 17.14 | 0 | 111 |
+| 14 | Cornelius | C7411DP | GT:CL HT:G IST:L | 268.3847 | 22.31 | 0.165 | 114 |
+| 15 | Viking | Blue River | 78-13 | - | 267.891 | 20.66 | 0.165 | 113 |
+| 16 | Prairie | 3054 | - | 265.6779 | 15.45 | 0.165 | 105 |
+| 17 | Burrus | 6N54 VT2P | GT:C2 HT:G IST:M | 264.5531 | 19.4 | 0 | 113 |
+| 18 | NK | 1228 | GT:C2 HT:B IST:L | 261.8818 | 20.13 | 0.165 | 112 |
+| 19 | Prairie | 6755 | - | 261.8163 | 17.77 | 0 | 110 |
+| 20 | Prairie | 6251 | - | 260.9335 | 17.04 | 0 | 112 |
+| 21 | Cornelius | C7202SSP | GT:C2R3L HT:B IST:L | 260.8648 | 20.83 | 0.165 | 112 |
+| 22 | Prairie | 6854 | - | 259.5944 | 18.13 | 0 | 110 |
+| 23 | Renk | RK832SSPRO | GT:C2R3 HT:B IST:M | 258.7068 | 19.22 | 0.335 | 112 |
+| 24 | Renk | RK800VT4P | GT:C2R2 HT:G IST:M | 258.0619 | 18.67 | 0.335 | 110 |
+| 25 | Prairie | 5883 | - | 257.7289 | 16.76 | 0.33 | 109 |
+| 26 | Cornelius | C7590DP | GT:CL HT:G IST:L | 257.065 | 21.04 | 0.165 | 115 |
+| 27 | Cornelius | C7308TRE | GT:C2L HT:G IST:L | 256.7744 | 19.56 | 0.33 | 113 |
+| 28 | Prairie | 8864 | - | 256.235 | 20.51 | 0 | 114 |
+| 29 | Cornelius | C6847TRE | GT:C2L HT:G IST:L | 256.0932 | 16.62 | 0.5 | 108 |
+| 30 | Cornelius | C6936SS | GT:C2R2L HT:B IST:L | 255.1524 | 18.04 | 0.335 | 109 |
+| 31 | Cornelius | C6824PCE | GT:C3L HT:B IST:L | 253.8542 | 17.08 | 0 | 108 |
+| 32 | Prairie | 4991 | - | 253.8036 | 15.5 | 0.165 | 107 |
+| 33 | NuTech | 72C1PCE | GT:C3L HT:B IST:M | 253.6839 | 20.71 | 0.165 | 112 |
+| 34 | Power Plus | 4V73AM | GT:C2 HT:B IST:M | 253.03 | 17.8 | 0 | 109 |
+| 35 | Renk | RK958VT2P | GT:C2 HT:G IST:M | 249.1038 | 22.62 | 0 | 115 |
+| 36 | NK | 1056 | GT:C2L HT:B IST:L | 246.8054 | 17.95 | 0.165 | 110 |
+| 37 | Prairie | 4885 | - | 245.9808 | 16.57 | 0 | 108 |
+| 38 | Renk | RK921VT2P | GT:C2 HT:G IST:M | 245.7581 | 19.07 | 0 | 115 |
+| 39 | Prairie | 9703 | - | 245.4187 | 22.45 | 0 | 116 |
+| 40 | Prairie | 8683 | - | 245.3874 | 20.51 | 0 | 115 |
+| 41 | NK | 1307 | GT:C2R2L HT:B IST:L | 236.511 | 21.61 | 0.165 | 113 |