rename: ppls-docs → crop-chem-docs

Repo/project rename to better reflect scope. PPLS is EPA's term for
their Pesticide Product Label System — accurate when the corpus was
EPA-only, narrow now that it also pulls from Bayer's own catalog
(and may expand to Syngenta/Corteva/BASF/FMC labels in the future).
crop-chem-docs scopes flexibly without acronyms to explain.

Renames:
- directory:           ppls-docs            → crop-chem-docs
- PRODUCT_NAME:        ppls                 → crop_chem
- Chroma collection:   ppls_docs            → crop_chem_docs  (in-place via .modify(), no re-embed)
- BM25 db:             bm25/ppls_docs.db    → bm25/crop_chem_docs.db
- MCP tool name:       ppls_api_lessons     → crop_chem_api_lessons
- FastMCP server name: ppls-docs            → crop-chem-docs
- Env vars:            PPLS_CORPUS_ROOT     → CORPUS_ROOT
                       PPLS_CHROMA_DIR      → CHROMA_DIR_OVERRIDE
- User-Agent:          ppls-docs-scraper    → crop-chem-docs-scraper

Preserved (intentional, correct):
- epa_ppls (source id) — refers specifically to EPA's PPLS database
- "EPA PPLS" mentions in regulatory text (lessons.md, server docstrings)
- PPLS_API_BASE / PPLS_PDF_BASE / PPLS_INDEX_URL_TEMPLATE in
  scrape/sources/epa_ppls.py — these point at EPA's actual endpoints

Memory entries get updated in a follow-up commit so the rename is
isolated.

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

rag/retrieval.py

@@ -20,10 +20,10 @@ from typing import Iterable, Protocol
 log = logging.getLogger(__name__)
 
 REPO_ROOT = Path(__file__).resolve().parent.parent
-CHROMA_DIR = Path(os.environ.get("PPLS_CHROMA_DIR") or REPO_ROOT / "chroma")
+CHROMA_DIR = Path(os.environ.get("CHROMA_DIR_OVERRIDE") or REPO_ROOT / "chroma")
 BM25_DB = Path(os.environ.get("BM25_DB",
-               str(REPO_ROOT / "bm25" / "ppls_docs.db")))
-COLLECTION = f"{os.environ.get('PRODUCT_NAME', 'ppls')}_docs"
+               str(REPO_ROOT / "bm25" / "crop_chem_docs.db")))
+COLLECTION = f"{os.environ.get('PRODUCT_NAME', 'crop_chem')}_docs"
 
 
 class Retriever(Protocol):