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/5905-342.md

@@ -0,0 +1,49 @@
+# HELENA 20% SEVIN DUST
+
+- EPA Reg No: **5905-342**
+- Registrant: HELENA AGRI-ENTERPRISES, LLC, D/B/A HELENA CHEMICAL COMP
+- Signal word: Caution
+- Active ingredients: Carbaryl (20%)
+- Label accepted: 1972-01-10
+- Source PDF: https://www3.epa.gov/pesticides/chem_search/ppls/005905-00342-19720110.pdf
+
+---
+CAUTION 
+Keep Out of Reach of Children 
+H,A.RMFUL iF !NHAl ED OR SWALLOWED 
+·.t -,',-"~L._._· ... ,,;',.rfl·IIL, _'" . I; ',_ , , _ _ I,! 
+"j breathinq of dust. 
+.; .. 
+'" ; 
+~ - - -
+:.:-- .... -" -
+-;.- - .. - ~ 
+-- - - ~ - -~ . - --
+OBSERVE TliESE PRECAUTIONS 
+,.-, ,', "-. 
+.i." 
+. . ~. : :\ - .. 
+Ui\1PLETELY f\1PI'y' (C·H~T/\I\JLri. KlJRY !)r·~uC;U) 
+r: H ~ M IC ;'d t, T ! [;\:.1 n~ ; N C H £: ,; [) [ l r I r,) AN h () L A T L! J 
+!, ILil T I"f'~ \'i, II h\\,\ Y ! iT'\1 W!\1 [I, :;UPP, I~:-; flUHf·; 
+fMPTy l:{I,'\IT'\"~fll '.f.l\"Plfl!.IY EXU,Chl [XIHlML 
+(~t\U1!(1~-j ' .. ~!; -;T/\{ /if j"~"/Vi\-'{ i'()~ ... j !;~i':-)t<.f f~ljf~\( 
+f\:-~HfL) '\~~~l} Hf '_.IUUL 
+50 POUNDS NET WEIGHT 
+ACTIVE INGREDIENT: 
+Corharyl (l-naphthyi N-methylcof­
+bomale) 
+INERT INGREDIENTS 
+TOT flU 
+c':)r".:!: :... .... ,;lJ !: __ 'f'!I, 0'- v0de{ (--.::'""'d,; :""$ n:)T -"'~\CI~"~" '~ 
+i~"ti. ic;,.; ieiif"; ''J(';:i b'...iY.: .,"h'::-~e~ jo-'i ,j-
+·~e. 
+o % S E V I N* DUST 
+. '" . f - -~ 
+RECOM\1ENDATIONS 
+f ' !-
+;.. j i .. -.J, , ; . 
+.. ,. , • 
+,-, . .: ... 
+--~&. 
+o o