radicle/sigrefs: Remove `MissingIdentity` error

Feature levels now treat this situation.

crates/radicle/src/storage/refs/sigrefs/read.rs

@@ -374,16 +374,6 @@ impl Commit {
                 FeatureLevel::Root
             }
         } else {
-            let err = error::Verify::MissingIdentity(error::MissingIdentity {
-                sigrefs_commit: self.oid,
-                expected,
-            });
-
-            log::debug!("Reading sigrefs will error in the future: {err}");
-
-            // TODO: Make this return the error
-            // and enable test `test::commit_reader::missing_identity`.
-
             FeatureLevel::None
         };
 

crates/radicle/src/storage/refs/sigrefs/read/error.rs

@@ -121,8 +121,6 @@ pub enum Verify {
         expected: RepoId,
         found: RepoId,
     },
-    #[error(transparent)]
-    MissingIdentity(MissingIdentity),
     #[error(
         "expected no parent reference in refs commit '{sigrefs_commit}', but found target '{actual}'"
     )]
@@ -138,10 +136,3 @@ pub enum Verify {
     #[error("expected identity root in refs commit '{sigrefs_commit}' but found none")]
     IdentityRootDowngrade { sigrefs_commit: Oid },
 }
-
-#[derive(Debug, Error, Clone, PartialEq, Eq)]
-#[error("expected repository identity {expected}, but found none under commit '{sigrefs_commit}'")]
-pub struct MissingIdentity {
-    pub(super) sigrefs_commit: Oid,
-    pub(super) expected: RepoId,
-}

crates/radicle/src/storage/refs/sigrefs/read/test/commit_reader.rs

@@ -72,23 +72,6 @@ fn missing_commit() {
     ));
 }
 
-#[test]
-#[ignore = "strict verification of `refs/rad/root` reverted due to compatibility issues"]
-fn missing_identity() {
-    let head = mock::oid(1);
-    let refs = [(mock::refs_heads_main(), mock::oid(10))];
-    let repo = MockRepository::new()
-        .with_commit(head, mock::commit_data([]))
-        .with_refs(head, refs)
-        .with_signature(head, 1);
-
-    let err = read_at(head, repo).unwrap_err();
-    assert!(matches!(
-        err,
-        error::Read::Verify(error::Verify::MissingIdentity { .. })
-    ));
-}
-
 #[test]
 fn read_ok() {
     let head = mock::oid(1);