docker: production image + Gitea Actions for monthly refresh

Dockerfile: self-contained image with corpus + Chroma + BM25 baked
in. Drawbar's compose pulls + runs without volume mounts. Built from
sources.json (labels schema), PRODUCT_NAME=crop_chem by default,
HYBRID_SEARCH=true (always-on for production quality). RERANK_URL +
OLLAMA_URL get set at compose time.

.gitea/workflows/refresh.yml: monthly cron (1st @ 06:00 UTC) does
full scrape → reindex → image push. Scrapes Bayer (~30 min) +
EPA PPLS row-crop filtered (~7h). Skips reindex+push if no corpus
diff. Tags pushed: :latest, :<sha12>, :corpus-<YYYY.MM.DD>.

.gitea/workflows/image-only.yml: on-demand or auto on code-only
pushes to main (paths: docs_mcp/, rag/, scrape/, requirements.txt,
Dockerfile, sources.json). Reindexes from committed corpus, builds
image, pushes. ~10 min vs ~9h full refresh.

.gitignore: corpus/ now COMMITTED (4,159 labels, 265 MB of .md +
sidecars). Lets image-only.yml rebuild indexes without re-scraping.
chroma/ + bm25/ still gitignored (regenerable binary indexes).

.dockerignore: drops venv, eval results, PLAN/README/CLAUDE.md,
deploy/, .git/ — keeps the image lean. corpus + chroma + bm25
explicitly NOT in dockerignore (those go INTO the image).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

corpus/epa_ppls/352-477.md

@@ -0,0 +1,194 @@
+# BLADEX 15 G GRANULES HERBICIDE
+
+- EPA Reg No: **352-477**
+- Registrant: CORTEVA AGRISCIENCE, LLC
+- Signal word: Caution
+- Active ingredients: Cyanazine (15%)
+- Label accepted: 1974-09-27
+- Source PDF: https://www3.epa.gov/pesticides/chem_search/ppls/000201-00332-19740927.pdf
+
+---
+------- ---- -
+BLADEX
+H 
+15G GRANULAR HERBICIDE 
+CAUTION: 
+Kf '-I' (lilT Of Hrf\(~H (II ('HII nr:rN, 
+ACTIVE INGREDIENTS 
+7 (4 chloIO·()·"thyldfll\l)() • tIU/!1l / 
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+INERT INGREDIENTS 
+BY WEIGHT 
+E) 
+'" 0.) 
+1()() 
+NOTE CONDITIONS OF SALE AND IVAIHIANT V III 
+FORE OPENING THIS CONTAINER IF TH[V ARF Nor 
+ACCEPTABLE RETURN UNOP[NFD PROOUCT, 
+SEE BACK PANEL FOR ADI)ITIONAL PRECAUTIONS, 
+TOIAL 
+lPI\ REGISTHATION NO, 201332 ZA 
+:"'1\\1 d ":"'''1' :',\ 
+• \f~I'lJ.tj t,.,>{ .P", 
+WEEDS CONTROLLED BY BLADE X ,< 15G HERBICIDE 
+GRASSES 
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+BROADCAST APPLICATION r~AT[S PEfi ACfH, 
+FOR BLADEX" 15G HERBICIDE 
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+NET WEIGHT: 50 LBS. 
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+SLJPPL[MENT AL CALIf:3f~ATI(lN CHART 
+Silt I'll 
+"lph :" 
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+SHEll CHEMICAL COMPANY, A Division of Sheil Oil Company, AGRICUl rURAL DIVISION, SAN RAMON, CA. 94583 
+1 
+. '