seed-mcp scaffold: clone docs-mcp-template, customize for crop_seed PRODUCT_NAME

Sibling project to crop-chem-docs, same MCP-template lineage. Corpus is
seed/hybrid varieties across 6 vendors instead of pesticide labels.

What's customized vs. the template:
- CLAUDE.md: vendor matrix, build priority, Pioneer fallback policy,
  canonical sidecar schema (per-crop), Golden Harvest disease-scale
  reversal gotcha, no-IPv6 / HTTPS-clone note
- README.md: vendor coverage table, tool list, phase status
- Dockerfile: PRODUCT_NAME=crop_seed default, sources.json (not
  bundles.json), HYBRID_SEARCH=true, OLLAMA_URL + RERANK_URL Docker
  DNS defaults (same llama-rerank sidecar as crop-chem-docs)
- .gitea/workflows/refresh.yml: monthly cron (seed catalogs move
  slowly), 5 GREEN scraper steps, corpus-YYYY.MM.DD tag for Drawbar
  pinning, continue-on-error on GC step
- .gitea/workflows/image-only.yml: paths filter + cancel-in-progress
  concurrency group
- scripts/registry_gc.py: lifted from crop-chem-docs (correct Gitea
  packages API URL + UA header to bypass CF block on default
  Python-urllib UA)
- sources.json: catalog of 6 sources + scope_filter + per-source
  schema notes + Pioneer-exclusion rationale
- scrape/runner.py: dispatcher with --all = GREEN-only
- scrape/sources/{bayer_seeds,golden_harvest,nk,agripro,becks_pfr,
  becks_products}.py: stub modules with implementation notes
- docs_mcp/server.py: PRODUCT_NAME default → crop_seed,
  PRODUCT_DOCS_URL → repo URL

Pioneer is intentionally NOT a source. ToS bans automation; dealer
locator is login-gated. The MCP returns a curated fallback lesson
directing the user to pioneer.com.

Next phases:
- Phase 1: implement bayer_seeds (lift-and-shift from crop-chem-docs
  Bayer scraper; same __NEXT_DATA__ infra)
- Phase 7: curate eval/queries.jsonl
- Phase 11: lessons.md with Pioneer fallback + disease-scale notes

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

Dockerfile

@@ -0,0 +1,61 @@
+# seed-mcp MCP server — production image.
+#
+# Structure: copy code first, then the regenerable indexes last so a
+# code-only change doesn't invalidate the corpus COPY layer.
+#
+# The container runs the MCP server via streamable-http on PORT 8000.
+# Override via MCP_HOST / MCP_PORT env if you front it with a different
+# reverse-proxy setup.
+#
+# Image is self-contained — corpus, Chroma collection, and BM25 db are
+# all baked in. Drawbar's docker-compose pulls the image and runs it;
+# no host volume mounts required for serve.
+#
+# RERANK_URL is set at compose time (points at the llama.cpp sidecar
+# on trashpanda's Tesla P4 — SHARED with crop-chem-docs). OLLAMA_URL
+# is set at compose time too. Defaults below assume same-stack Docker
+# DNS names.
+
+FROM python:3.12-slim
+
+WORKDIR /app
+
+# Install Python deps first for cacheability.
+COPY requirements.txt /app/
+RUN pip install --no-cache-dir -r requirements.txt
+
+# Code.
+COPY scrape /app/scrape
+COPY rag /app/rag
+COPY docs_mcp /app/docs_mcp
+
+# Source catalog. Lists the corpus sources (Bayer seeds + Golden
+# Harvest + NK + AgriPro + Beck's PFR + Beck's products).
+COPY sources.json /app/
+
+# Regenerable indexes. CI builds these from corpus/ in the same job
+# that builds the image. Listed last so code changes don't invalidate
+# the COPY layer cache for these (much larger) directories.
+#
+# bm25/ is only consulted when HYBRID_SEARCH=true (the server falls
+# back to dense-only if it's missing).
+COPY corpus /app/corpus
+COPY chroma /app/chroma
+COPY bm25 /app/bm25
+
+ENV PYTHONUNBUFFERED=1 \
+    PRODUCT_NAME=crop_seed \
+    MCP_TRANSPORT=streamable-http \
+    MCP_HOST=0.0.0.0 \
+    MCP_PORT=8000 \
+    HYBRID_SEARCH=true \
+    OLLAMA_URL=http://ollama:11434 \
+    RERANK_URL=http://llama-rerank:8080
+    # Defaults above assume the MCP container shares a Docker network
+    # with services named `ollama` and `llama-rerank`. Override either
+    # in the compose `environment:` block if your stack uses different
+    # service names or if you want to point at off-stack hosts.
+
+EXPOSE 8000
+
+ENTRYPOINT ["python", "-m", "docs_mcp.server"]