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/5905-297.md

@@ -0,0 +1,211 @@
+# HELENA 2% PHOSDRIN DUST
+
+- EPA Reg No: **5905-297**
+- Registrant: HELENA AGRI-ENTERPRISES, LLC, D/B/A HELENA CHEMICAL COMP
+- Signal word: Danger
+- Active ingredients: Mevinphos (2%)
+- Label accepted: 1974-08-12
+- Source PDF: https://www3.epa.gov/pesticides/chem_search/ppls/005905-00297-19740812.pdf
+
+---
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+Toxic to fish and wildlife. Do not 
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+to any areas not specified on the label. 
+D t h ~f' f o no use w ere runc~ 1S a requent 
+problt::m. 
+Completely err.rty co .... tainer and bury un­
+us(!d chc--micals at: leu.st 18 inches deep in 
+an isolated locu.tion away from water 
+supplies. Burn emf-'ty container immediate­
+ly. Exercise extreme caution and stay wel 
+away fLom the smoke. Bury ashes u.nd 
+residue. 
+FI~ST AIL> TREATMENT 
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+Swc~t, Pop, Forage and Grain) - AptiJs, 
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