Fix CI: enable test editions in new footer-metadata tests, rustdoc links, Python goldens

The develop merge brought in the file-level metadata tests (#8740), which
write with bare sessions that enable no editions and now fail validation.
Enable the crate's test edition in those sessions, matching the other
vortex-file unit tests.

Also re-qualify the vortex::editions module-doc links (module docs resolve
at the lib.rs `pub mod` site) and update the Python doctest golden file
sizes for the edition-derived footer context.

Signed-off-by: Claude <noreply@anthropic.com>

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01CK2nCuXnyd2g3mNHQC8Lz2

Author: claude

vortex-file/src/multi/mod.rs

@@ -341,6 +341,7 @@ mod tests {
             .with::<RuntimeSession>()
             .with::<MultiFileSession>();
         crate::register_default_encodings(&session);
+        crate::enable_all_registered_array_encodings(&session);
 
         let expected = ByteBuffer::copy_from(b"cached metadata");
         let mut output = ByteBufferMut::empty();
@@ -441,6 +442,7 @@ mod tests {
             .with::<RuntimeSession>()
             .with::<MultiFileSession>();
         crate::register_default_encodings(&session);
+        crate::enable_all_registered_array_encodings(&session);
 
         let mut out_a = ByteBufferMut::empty();
         session

vortex-file/src/open.rs

@@ -648,6 +648,7 @@ mod tests {
             .with::<LayoutSession>()
             .with::<RuntimeSession>();
         crate::register_default_encodings(&session);
+        crate::enable_all_registered_array_encodings(&session);
 
         let metadata = ByteBuffer::copy_from(vec![0x5a; INITIAL_READ_SIZE * 2]);
         let mut output = ByteBufferMut::empty();
@@ -721,6 +722,7 @@ mod tests {
             .with::<LayoutSession>()
             .with::<RuntimeSession>();
         crate::register_default_encodings(&session);
+        crate::enable_all_registered_array_encodings(&session);
 
         let value = ByteBuffer::copy_from(b"supplied-footer metadata");
         let mut output = ByteBufferMut::empty();

vortex-python/src/io.rs

@@ -258,7 +258,7 @@ impl PyVortexWriteOptions {
     /// >>> vx.io.VortexWriteOptions.default().write(sprl, "chonky.vortex")
     /// >>> import os
     /// >>> os.path.getsize('chonky.vortex')
-    /// 215940
+    /// 215900
     ///
     /// Wow, Vortex manages to use about two bytes per integer! So advanced. So tiny.
     ///
@@ -268,7 +268,7 @@ impl PyVortexWriteOptions {
     ///
     /// >>> vx.io.VortexWriteOptions.compact().write(sprl, "tiny.vortex")
     /// >>> os.path.getsize('tiny.vortex')
-    /// 55068
+    /// 55028
     ///
     /// Random numbers are not (usually) composed of random bytes!
     #[staticmethod]

vortex/src/editions/mod.rs

@@ -5,12 +5,13 @@
 //!
 //! [`vortex_edition`] provides the types, session variables, and test harness. The actual
 //! first-party declarations live here, one module per edition. The default session first
-//! registers them with [`register_default_editions`] and then selects its write policy with
-//! [`enable_default_editions`].
+//! registers them with [`crate::editions::register_default_editions`] and then selects its
+//! write policy with [`crate::editions::enable_default_editions`].
 //!
 //! The default file writer resolves the session's enabled editions at write time. The
-//! facade enables the newest frozen `core` edition, [`CORE_2026_07_0`], and additionally
-//! enables the latest unstable edition when the `unstable_encodings` feature is selected.
+//! facade enables the newest frozen `core` edition, [`crate::editions::CORE_2026_07_0`],
+//! and additionally enables the latest unstable edition when the `unstable_encodings`
+//! feature is selected.
 
 pub mod core;
 #[cfg(test)]