fix: release the type registry when a model version is selected

[ehennestad]

Stacked on #190. One fix to selectModelVersion, so that selecting a model version within a session actually loads that version's classes.

Why

A model version is selected by putting its generated classes on the search path. MATLAB reads a class definition from the path again only once nothing holds an instance of it. The type registry, MetaTypeRegistry, holds enumeration values of the version it was built for, and nothing released it on a switch: getSingleton rebuilds it only when next asked. Left in place, it kept the previous version's openminds.enum.Types in memory.

selectModelVersion then rebuilt the instance library (#184) against that pinned enumeration, so every type the two versions do not share came out untyped, with a warning that named them. On CI that was six warnings per run, from the classes that switch to v3.0 and v4.0, listing exactly the types those versions have and latest does not: BrainAtlas, CommonCoordinateSpace, UBERONParcellation and the rest. Measured in one process, switching to v3.0 with the registry alive left 2,827 of 17,096 instances untyped.

The instance library itself does not pin anything, since it records type names as strings, and neither does an ordinary instance of a type class; with only those alive the enumeration reloads on the switch.

What

MetaTypeRegistry.notifyModelVersionChanged deletes the registry without rebuilding it, and selectModelVersion calls it after the path change, before the pause that lets the reload happen and before the instance library resolves types against the reloaded classes. The next use of the registry rebuilds it, as getSingleton already does when it finds none.

Measured in one process: switch with the registry alive, 2,827 untyped and the warning; release the registry, the v3.0 enumeration is what meta.class reports in memory; rebuild the library, no warning and none untyped.

Tests

SelectModelVersionTest is new: with the registry held, select v3.0 and check that the Types enumeration in memory declares BrainAtlas and not AnatomicalAtlas, which is what distinguishes v3.0's from latest's. InstanceLibraryIntegrationTest gets back the assertion the pin had forced out of it: after selecting a version, every instance of that version resolves to a type.

Notes

On R2026a this removes the warning from every switch in the suite. On R2022a it still fires twice, on the first switch to another version in a session: there the enumeration was observed reloaded only after selectModelVersion had returned, later than the library resolves types against it, and the next switch is clean. Accepted for now.

This does not make version switching robust in general; #169 covers that. Anything else that holds a Types value or an instance of a generated class across a switch still pins the previous version, and the warning on #184 now says so and what to do. What this fixes is that the toolbox itself was one of those holders.

🤖 Generated with Claude Code

[github-actions]

Test Results (R2022a)

855 tests  +1   851 ✅ +1   3m 53s ⏱️ +53s
 27 suites +1     4 💤 ±0 
  1 files   ±0     0 ❌ ±0 

Results for commit 17efec2. ± Comparison against base commit 66dcf6b.

♻️ This comment has been updated with latest results.

[github-actions]

Test Results (R2026a)

855 tests  +1   853 ✅ +1   5m 29s ⏱️ + 1m 45s
 27 suites +1     2 💤 ±0 
  1 files   ±0     0 ❌ ±0 

Results for commit 17efec2. ± Comparison against base commit 66dcf6b.

♻️ This comment has been updated with latest results.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.14%. Comparing base (75c3ca5) to head (17efec2).

Additional details and impacted files

@@                        Coverage Diff                        @@
##           instance-library-test-fixture     #191      +/-   ##
=================================================================
- Coverage                          80.67%   80.14%   -0.53%     
=================================================================
  Files                                423      423              
  Lines                               4387     4392       +5     
=================================================================
- Hits                                3539     3520      -19     
- Misses                               848      872      +24     

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