fix: ignore stray files when resolving latest schema version

[ehennestad]

Motivation

Problem — On macOS, Finder silently drops a .DS_Store file into MatNWB's nwb-schema/ folder as soon as the folder is browsed. Any such stray entry makes generateCore() (called without a version argument, i.e. "use latest") silently resolve to an old schema version — 2.1.0 instead of 2.10.0 — so the user unknowingly generates classes for a years-old schema. No error or warning is raised.

Solution — When determining the latest schema version, only folder entries whose name is an exact major.minor.patch version number are considered, so stray files can no longer influence the result.

What changed

• matnwb.common.findLatestSchemaVersion (used by generateCore to resolve the default schema version) now ignores any entry in nwb-schema/ that is not named as an exact version number.
• Behavior with a clean nwb-schema/ folder is unchanged.

Implementation notes

Previously only . and .. were excluded from the directory listing. For any other non-version entry, sscanf(name, '%d.%d.%d') returned empty, silently dropping that entry from the version-comparison matrix while it remained in the name list — an off-by-one that made the max-version index point at the wrong name. Entries are now filtered with the anchored pattern ^\d+\.\d+\.\d+$ before parsing.

Examples

With a stray (hidden) file present in nwb-schema/:

strayFile = fullfile(misc.getMatnwbDir(), 'nwb-schema', '.stray_test_file');
fclose(fopen(strayFile, 'w'));
latestVersion = matnwb.common.findLatestSchemaVersion()
delete(strayFile)

Before (silently wrong version):

latestVersion =

    '2.1.0'

After:

latestVersion =

    '2.10.0'

How to test

Run the snippet above on this branch — the result is '2.10.0' regardless of stray files in nwb-schema/. On macOS, simply browsing nwb-schema/ in Finder (which creates .DS_Store) and then calling generateCore() also exercises the fix.

Checklist

• Have you ensured the PR description clearly describes the problem and solutions?
• Have you checked to ensure that there aren't other open or previously closed Pull Requests for the same change?
• If this PR fixes an issue, is the first line of the PR description fix #XX where XX is the issue number?

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.45%. Comparing base (2ee6a6b) to head (5724f9c).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #854   +/-   ##
=======================================
  Coverage   95.45%   95.45%           
=======================================
  Files         228      228           
  Lines        8080     8082    +2     
=======================================
+ Hits         7713     7715    +2     
  Misses        367      367           

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