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/1812-73.md

@@ -0,0 +1,28 @@
+# PEE-WEE 2.5% METHYL PARATHION
+
+- EPA Reg No: **1812-73**
+- Registrant: GRIFFIN L.L.C.
+- Signal word: Danger
+- Active ingredients: Methyl parathion (2.5%)
+- Label accepted: 1967-02-27
+- Source PDF: https://www3.epa.gov/pesticides/chem_search/ppls/001812-00073-19670227.pdf
+
+---
+1-
+- --- ------ - ----- - -----------------------------------
+PEE-GEE 
+21j2~o METHYL PARATHION 
+, ii' ,'! ) i 1 " I , 
+. ". I. •. " 
+I \ . \ I ) , 
+; , 
+GENERAL !)1l-it:(T:(,N" ,,','" 
+~O Y BE AN S" '--
+TOMATOES .,' t' 
+rIJRNln 
+DANGER 
+• 
+" , 
+:1ANG[R,' ' . 
+! • I ! i : t'! . 
+I " I . , '