test(repo): the term check covers shared/ too; changelog notes the commons sync

shared/ now carries portfolio-optimiser-commons 8aa19ec (squash merge in the
parent commits), and no file under it matches the local term list any more
(22 of 67 files before, 0 of 50 after). The shared/ exception and the test
that kept it alive are removed, so the repository-wide check reads every
tracked file. The surface-count pin follows the manifest: 1427 -> 1410.

CHANGELOG 1.3.0 gains one line for the sync; the version stays 1.3.0.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

CHANGELOG.md

@@ -11,6 +11,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Replace sector-specific example material with generic, fictitious examples. The context sets
   under `contexts/`, the packaged knowledge bases and the example bundles are all fictitious now;
   gate figures measured on them are not comparable with those of earlier releases.
+- Sync `shared/` from portfolio-optimiser-commons 0.2.0, which removes two example bundles there
+  and makes its remaining examples fictitious as well. The repository-wide term check now covers
+  `shared/` too.
 
 ## [1.2.0] - 2026-09-20