R-CMD-check / check (push) Successful in 2m5s
`cog_gov_search()` (and every other verb) used to fail with a cryptic `jsonlite` lexical error when the package's placeholder default URL was hit and the server returned an HTML welcome page that got cached as `manifest.json`. Three guards added: 1. `.check_url_configured()` aborts with class `uscogdata_url_not_configured` when the resolved URL is empty or still contains the `REPLACE_WITH_SHARE_TOKEN` sentinel. Message names both `Sys.setenv(USCOGDATA_URL = ...)` and `options(uscogdata.url = ...)` remediations and points at the bundled fixture. 2. `.fetch_or_cache_manifest()` parses the response body before persisting it. Non-JSON payloads raise class `uscogdata_invalid_manifest` (URL, Content-Type, parse error) and never touch the on-disk cache. 3. Cache writes are atomic via a sibling tempfile + `file.rename`, and existing caches with non-JSON content are silently refetched instead of returning a parse error to the caller. Local-path manifests that aren't valid JSON now surface the same `uscogdata_invalid_manifest` class with file context.