repo: move to github.com/tangency-labs/fieldcraft (URLs, updater, Pages)

The updater's release endpoint, docs, README, release notes and the Pages
URL point at the tangency-labs org. App IDs (io.github.jyviko.fieldcraft)
stay unchanged so installed copies keep their identity and settings.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01UhhZMBTviDQxZvwnyP89fo

crates/update/src/lib.rs

@@ -35,7 +35,7 @@ pub use release::{Asset, Check, Release};
 pub use version::Version;
 
 /// The repository releases come from.
-pub const REPO: &str = "jyviko/fieldcraft";
+pub const REPO: &str = "tangency-labs/fieldcraft";
 /// The GitHub API.
 pub const DEFAULT_HOST: &str = "https://api.github.com";
 /// Replaces [`DEFAULT_HOST`] (and allows plain `http`), for tests against a local server only.

crates/update/src/net.rs

@@ -164,9 +164,9 @@ mod tests {
         // Errors are messages, never panics.
         let missing = Client::new(&server.url()).release(&Which::Version(Version::parse("1.2.3").unwrap())).unwrap_err();
         assert!(missing.to_string().contains("no published release of FieldCraft 1.2.3"), "{missing}");
-        server.route("/repos/jyviko/fieldcraft/releases/latest", 200, b"not json".to_vec());
+        server.route("/repos/tangency-labs/fieldcraft/releases/latest", 200, b"not json".to_vec());
         assert!(matches!(Client::new(&server.url()).check(), Err(Error::Release(_))));
-        server.route("/repos/jyviko/fieldcraft/releases/latest", 403, b"{}".to_vec());
+        server.route("/repos/tangency-labs/fieldcraft/releases/latest", 403, b"{}".to_vec());
         assert!(matches!(Client::new(&server.url()).check(), Err(Error::Network(_))));
         assert!(matches!(Client::new("http://127.0.0.1:1").check(), Err(Error::Network(_))));
     }

crates/update/src/release.rs

@@ -129,7 +129,7 @@ mod tests {
     pub(crate) fn github(tag: &str) -> Value {
         json!({
             "tag_name": tag,
-            "html_url": format!("https://github.com/jyviko/fieldcraft/releases/tag/{tag}"),
+            "html_url": format!("https://github.com/tangency-labs/fieldcraft/releases/tag/{tag}"),
             "body": "## What's new\n- updates",
             "draft": false,
             "prerelease": false,