Scaffold the owdata package with washr 1.1.0

[larnsce]

Goal

Scaffold the owdata R package on main: the index metapackage for the openwashdata R data packages. Skeleton only; parsers, harvest, data model and exports are #3 to #6.

Rewritten 2026-09-04 per dev/decisions-2026-09.md.

Target layout

owdata/
├── DESCRIPTION            # Package owdata, License CC BY 4.0, Imports tibble + utils
├── CLAUDE.md              # #16
├── R/
│   ├── sysdata.rda        # internal catalog snapshot written by the harvest (#5)
│   ├── owd_accessors.R    # owd_packages(), owd_datasets(), owd_variables()
│   ├── owd_search.R
│   ├── owd_install.R
│   ├── parsers.R          # #3, in R/ so the tests run against the built tarball
│   └── zzz.R              # .onAttach startup message only
├── inst/extdata/          # owd_packages.csv, owd_datasets.csv, owd_variables.csv
├── data-raw/
│   ├── harvest.R          # #4
│   ├── harvest_helpers.R  # local and GitHub backends
│   ├── exclude_repos.csv  # denylist backstop
│   ├── packages.json      # r-universe registry draft, generated
│   └── harvest_report.md  # generated
├── tests/testthat/        # test-parsers.R, test-schema.R, fixtures/
├── .github/workflows/     # R-CMD-check.yaml, pkgdown.yaml, test-coverage.yaml, harvest.yaml (#9)
└── _pkgdown.yml           # written by washr::setup_website(), branded by washr::use_brand()

The catalog tables are internal data behind accessor functions, not lazydata: a lazydata object and an exported function cannot both be called owd_packages. There is no data/ directory and no R/data.R.

Tasks

• usethis::create_package(), then washr::setup_ci(), washr::update_description(), washr::setup_website(), washr::use_brand(). owdata is built with the tool it indexes.
• DESCRIPTION: Title "Index of openwashdata R Data Packages", Authors@R with ORCID, License CC BY 4.0, URL and BugReports, Config/Needs/website: rmarkdown.
• testthat 3 setup; copy test-coverage.yaml from washr (coverage in the job summary, no Codecov).
• Commit the workflows by hand. Session tokens cannot write .github/workflows/, which is why PR feat: implement the owdata index metapackage at v0.0.0.9000 #15 parked them.
• CLAUDE.md per Write CLAUDE.md #16.
• README: purpose, the three accessors, owd_search(), owd_install(), and one paragraph on how a package gets listed: publish with washr, mint the Zenodo DOI, the weekly harvest picks it up.

Acceptance criteria

• devtools::check() passes on the skeleton
• R-CMD-check, pkgdown and test-coverage workflows green on main
• A second run of every washr function above changes no file