add-doi: confirm the Zenodo website link, accept the community request, and output the data availability text (after washr 1.3.0) #99

Follow-up from the guluswm 1.0.0 release (3 November 2026) and two washr changes planned for washr 1.3.0.

Changes to skills/add-doi/SKILL.md once washr 1.3.0 is the floor (pkgreview-core/WASHR_FLOOR):

1. Step 7, Zenodo record review. With write_zenodo_json(): link the package website in the Zenodo description and related identifiers washr#154 (PR feat: link the package website in .zenodo.json washr#156), .zenodo.json carries the website link in the description and as an isDocumentedBy related identifier, and the repository as isSupplementTo. The prompt then only confirms these instead of asking the maintainer to add them by hand.
2. Community request. guluswm's .zenodo.json listed the openwashdata community, yet the record appeared without it until it was added by hand in the Zenodo editor. The GitHub integration submits a community request that a curator has to accept. Step 7 should say so and point to the community's request inbox, so the record does not stay outside the community.
3. Text for the article authors. With data_availability_statement(): draft the citation and data availability text for the article that uses a data package washr#155, add a last step that calls washr::data_availability_statement() and shows the reference entry and the data availability statement for the email to the authors (written by hand for guluswm).

Until washr 1.3.0 is released, the current manual prompt stays.