Durable web-research references for this project. Before re-fetching an external source, run from the workspace root:

python -X utf8 scripts/check-web-reference-ledger.py --query "<topic>"

After web research that changes this project's code, tests, data interpretation, or a decision, add a doc here with frontmatter:

---
last_verified: YYYY-MM-DD
sources:
  - <source name or URL>
reliability: primary | vendor-doc | analyst | secondary
aliases:
  - <optional synonym so a differently-worded query still finds this>
refresh_trigger: <when the source can affect this project's code or decisions>
---

Full rule: root CLAUDE.md "Web Research — Reference Ledger" plus docs/ops/CODEX-WEB-REFERENCE-LEDGER.md. Helpfulness (how many re-fetches a doc has blocked) is surfaced by the scanner via the --by-helpfulness flag.