gh_plot_reports corpus (4,299 plots) + concurrency + 4-GPU pool

CORPUS — 4,299 GH plot reports added (3,797 written + 502 from the
earlier slow run + 319 sitemap-listed URLs that 404'd as
discontinued). Combined with prior 760 varieties + 14 AgriPro
trials = 5,073 total chunks now indexed.

scrape/sources/gh_plot_reports.py — concurrency speedup:
- 4 worker threads (ThreadPoolExecutor), each with its own
  requests.Session for connection-pool efficiency.
- Shared class-level rate limiter (0.25 sec between ANY two
  requests across all threads). Net throughput ~4 req/sec —
  well below any rate-limit threshold a public site enforces.
- Diagnosis vs original 1 req/sec: GH had ZERO rate limiting,
  zero 429s, zero retries. The 1 sec self-throttle was just too
  conservative. Bench:
    1 worker  / 1.0 sec throttle:  ~0.4 plots/sec (190 min ETA)
    4 workers / 0.25 sec throttle: ~3 plots/sec  (~25 min actual)

rag/chunk.py — chunk size cap for nomic-embed-text's 2048-token
context window:
- Empirically tested: failure threshold is ~5,250 chars on
  numeric-heavy trial chunks (chars/token ratio 2.4 vs 3.5 for
  prose). Cap at 4,500 chars to be safely under at worst-case
  2.2 chars/token.
- Applied to BOTH variety and trial chunks. Marked truncated
  chunks with metadata.embed_truncated = True; FULL text stays
  in the on-disk .md for get_page to return verbatim.

.gitea/workflows/{refresh,image-only}.yml — OLLAMA_URL pool
restructured for the 4 GPU-pinned endpoints. Bench (50-chunk
batches on nomic-embed-text):

    .0.125:11434  (RTX 40-series)  242 embeds/sec  ← weight ×4
    .0.2:11436    (GPU-pinned)     108 embeds/sec  ← weight ×2
    .0.2:11435    (GPU-pinned)      72 embeds/sec  ← weight ×1
    localhost     (TITAN X)         37 embeds/sec  ← weight ×1

Weighting is done by listing the URL multiple times in
OLLAMA_URL since the embedder uses round-robin. .0.2:11434 is
explicitly EXCLUDED — it isn't pinned to a specific GPU.

Combined index rebuild for 5,073 chunks now finishes in ~3 min
(was 19+ on the single-endpoint pool).

Smoke tests:
✓ list_versions: 5,073 docs across 6 sources, 2 vendors, 6
  brands, 4 crops (corn 2711, soy 2016, silage 223, wheat 123).
✓ search_trials({crop=corn, state=IA, year=2024}): 3 IA 2024
  corn trials surfaced.
✓ search_trials("Phytophthora resistance soybean trial"): NK
  NK43-W1XFS top-1 in LA 2024 trial (cross-vendor result).
✓ search_trials("AP Iliad Idaho wheat"): AgriPro Washington/N
  Idaho 2025 trial surfaced.
✓ search_trials(product=DKC65-95): 3 corn trials containing
  that hybrid in IL/IA 2024.
✓ search_trials(product=NK1701): 3 corn trials in AR/MS 2024.
✓ Product filter correctly returns EMPTY for products that
  aren't in the corpus (DKC65-20 is a 2023 product; 2023 plots
  deferred). Anti-hallucination contract preserved.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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# Soybean yield trial — North Carolina, 2025
- **Source:** Golden Harvest plot report (cross-vendor head-to-head)
- **Crop:** Soybean
- **State:** North Carolina (NC)
- **Year:** 2025
- **Plot ID:** 2467234
- **Cooperator:** Jeffrey & Brooks Barnes
- **Planted:** 2025-06-06
- **Harvested:** 2025-10-24
- **Population:** 130,000 seeds/acre
- **Row width:** 30"
- **URL:** https://www.goldenharvestseeds.com/soybean/plot-report/nc/2025/2467234
---
## Results (top-down by rank)
| Rank | Brand | Product | Traits | Yield | %MST | Test Weight | Gross Revenue |
|---|---|---|---|---|---|---|---|
| 1 | NK | NK52-D6E3 | Enlist E3 ® | 59.0 | 9.1 | 58.0 | $619.50 |
| 2 | NK | NK47-G5E3S | Enlist E3 ® STS ® | 57.9 | 8.9 | 57.0 | $607.95 |
| 3 | NK | NK49-U9E3S | Enlist E3 ® STS ® | 57.0 | 9.2 | 57.0 | $598.50 |
| 4 | NK | NK50-W4E3S | Enlist E3 ® STS ® | 55.5 | 9.2 | 57.0 | $582.75 |
| 5 | NK | NK49-C2XFS | XtendFlex ® STS ® | 54.6 | 9.2 | 58.5 | $573.30 |
| 6 | NK | NK52-M2XFS | XtendFlex ® STS ® | 53.0 | 9.2 | 58.0 | $556.50 |
| 7 | NK | NK47-U1XFS | XtendFlex ® STS ® | 52.6 | 9.2 | 57.5 | $552.30 |
| 8 | NK | NK49-N7XF | XtendFlex ® | 50.5 | 9.1 | 57.0 | $530.25 |
| 9 | NK | NK58-Y9XF | XtendFlex ® | 46.2 | 8.7 | 58.5 | $485.10 |
| 10 | NK | NK54-J9XFS | XtendFlex ® STS ® | 45.3 | 9.0 | 58.0 | $475.65 |
| 11 | NK | NK58-B8E3S | Enlist E3 ® STS ® | 40.0 | 9.1 | 58.5 | $420.00 |
Top 5 by Yield: NK52-D6E3 (NK) 59.0, NK47-G5E3S (NK) 57.9, NK49-U9E3S (NK) 57.0, NK50-W4E3S (NK) 55.5, NK49-C2XFS (NK) 54.6.