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/264-239.md

@@ -0,0 +1,238 @@
+# BROMINAL PLUS BROADLEAF HERBICIDE
+
+- EPA Reg No: **264-239**
+- Registrant: BAYER CROPSCIENCE, LLC
+- Signal word: Warning
+- Active ingredients: Butoxyethyl 2-methyl-4-chlorophenoxyacetate (31.6%); Bromoxynil octanoate (30.7%)
+- Label accepted: 1982-04-19
+- Source PDF: https://www3.epa.gov/pesticides/chem_search/ppls/000264-00239-19820419.pdf
+
+---
+• 
+'. • • 
+•• 
+• • 
+'-
+• 
+BRO~1INAL PLUS,.",,,·,,' 
+BROADLEAF HERBICIDE \-~,'" ,," 
+Combination of bromoxynil end MCPA. -
+. Controls annual broadleaf weeds In wheal, 
+barley, oats and rye. 
+WARNING: Keep out of reach of children. 
+~ee other cautions on right side panel . 
+'-----.ru--- -
+fDA COMMERCIAL OR AGR1CUtlUfilAL USE ONLY. 
+_____ NOT fOR AE$IOENTIAl USE. 
+ACTIVE INGREDIENTS: 
+Oct,noi, K:d 'I~' of hf1)mo",nil" 
+Il.5-d;b'0010"'hyd,o~ybef,lonlurt.) .••••••••••••••..••.•• 30.7% 
+Buloxy.1fIar.c!.II.r of 2-m."yl~II!Dropfl.no .. 't_I~ ~id" ••• 31.1% 
+INERT INGRI: 01 ENTS: •••••••••••••••••• ~ •••••••••••••••• 31."" 
+'I'o"'~"l'nn KId .~l .. l.nl :r'.1" by ... Ii'l .... 2 pound, PI' ""_ 
+"Me'''' .. ;If.~I .. h .... 21.'" by ... Tit" or Z""'ndI~."""" 
+-~!'~'':'=-:-::::-::-= 
+UNION CARBIDE AGRICULTURAL 
+PRODUCTS COMPANY, INC. 
+RESEARCH TRIANGLE PARK, NC 27101 
+CllnlOfl. IA. • .1,. .10"""" 110. 
+~ ~ £lOA R.a. No. 264·m·ZA, 
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