API: a wiki says it takes no proposals, rather than 'no such repository' a0dd06b0094e

    // A wiki (`NAME.wiki`) has no row of its own, so no proposals, issues

    // or runs (oxygenhub#128): say so to those who may read it, rather than

    // that it does not exist.

    if let Some(base) = name.strip_suffix(".wiki") {

        if let Some(row) = db::repos::get(&app.db, owner, base).await? {

            let role = auth::roles::role_for(&app.db, c.account.as_ref(), &row).await?;

            if auth::roles::allows(role, Access::Read) {

                return Err(not_found(&format!(

                    "{owner}/{name} is the wiki of {owner}/{base}: it is cloned and pushed with oxy, and takes no proposals, \

                     issues or runs; to publish a bookmark, merge it into main (oxy merge BOOKMARK on main) and push main"

                )));

            }

        }

    }

    // A wiki takes no proposals, and says so rather than "no such

    // repository" (oxygenhub#128); a repository's that does not exist

    // still does not.

    let (st, v) =

        api(app, "POST", "/api/v1/repos/andy/demo.wiki/proposals", Some(&bob_rw), Some(r#"{"title":"W","target":"main","source":"p"}"#))

            .await;

    let detail = v["detail"].as_str().unwrap_or_default();

    assert!(st == StatusCode::NOT_FOUND && detail.contains("is the wiki of andy/demo") && detail.contains("push main"), "{v}");

    let (_, v) = api(app, "GET", "/api/v1/repos/andy/nope.wiki/proposals", Some(&bob_rw), None).await;

    assert_eq!(v["detail"], "no such repository");

A repository may have a **wiki** (oxygenhub#104): Markdown pages kept as an Oxygen repository of their own under `<data>/wikis/<owner>/<name>`, with no row of its own; it follows the repository's visibility, roles, archiving, transfer and deletion. A page `Getting-Started` is the file `Getting-Started.md` at the root of bookmark `main`; `_Sidebar.md` is shown beside every page, and `Home` is the front page. On the web (`/{owner}/{name}/wiki`, `/wiki/{page}`, `/wiki/{page}/edit`, `/wiki/{page}/history`, `/wiki/_pages` with a search over titles and text, `/wiki/_raw/{path}` for images): readers read, writers create, edit, rename and delete pages, and every edit is a change authored by the user and signed by the hub as their delegate, exactly as a code edit (§6.9), so it needs the same delegation. Links between pages are relative (`[Other](Other)`). By client, the wiki is `oxy clone HUB/{owner}/{name}.wiki`: the wire protocol maps that name onto the wiki store with the repository's permissions, pushes need write access and not archived, start no run and ring no webhook; a repository can therefore not be named `*.wiki`. A wiki takes no proposals, issues or runs: the API answers a reader asking for one under `OWNER/NAME.wiki` with a 404 that says so and how to publish a bookmark (merge it into `main` and push), not "no such repository" (#128). The Wiki tab shows when a wiki exists or the viewer may start one. Settings › Advanced › Delete wiki data moves the wiki to the trash. Audited as `wiki.edited`, `wiki.deleted`, `wiki.data_deleted`; webhooks get a `wiki` event.