Fix Table.describe() to show core types instead of native types

When a column is declared with a core type (like uuid, int32, float64),
describe() now displays the original core type name instead of the
underlying database type (e.g., shows "uuid" instead of "binary(16)").

Uses the Attribute.original_type field which stores the core type alias.

Bump version to 2.0.0a2.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: dimitri-yatsenko

src/datajoint/table.py

@@ -886,9 +886,11 @@ def describe(self, context=None, printout=False):
                             attributes_declared.update(fk_props["attr_map"])
             if do_include:
                 attributes_declared.add(attr.name)
+                # Use original_type (core type alias) if available, otherwise use type
+                display_type = attr.original_type or attr.type
                 definition += "%-20s : %-28s %s\n" % (
                     (attr.name if attr.default is None else "%s=%s" % (attr.name, attr.default)),
-                    "%s%s" % (attr.type, " auto_increment" if attr.autoincrement else ""),
+                    "%s%s" % (display_type, " auto_increment" if attr.autoincrement else ""),
                     "# " + attr.comment if attr.comment else "",
                 )
         # add remaining indexes

src/datajoint/version.py

@@ -1,4 +1,4 @@
 # version bump auto managed by Github Actions:
 # label_prs.yaml(prep), release.yaml(bump), post_release.yaml(edit)
 # manually set this version will be eventually overwritten by the above actions
-__version__ = "2.0.0a1"
+__version__ = "2.0.0a2"