[LukasGold]

Fixes #176.

Changes

• OSW.fetch_schema reads the cache state once, enables the cache, and
  restores the state in a finally block around the loop over schema titles.
• OSW._fetch_schema no longer reads or restores the cache state. A note in
  its docstring says where that now happens.
• The model reload under if fetchSchemaParam.final: keeps the
  reload_module_or_restore(...) call from stage. Only the cache restore
  that followed it is removed.
• New unit tests in tests/test_fetch_schema_cache.py.

Rationale

• site_cache_state was a local of _fetch_schema, which runs once per title
  and again recursively per $ref. From the second title on, the snapshot
  already read the state the previous call had set, so if not site_cache_state was false and disable_cache() was never called.
• The restore was also unreachable on two paths: the early return for a
  missing schema page, and any exception. A finally in the caller covers
  both, including an exception raised by reload_module_or_restore.
• _fetch_schema is private and only called from fetch_schema and from
  itself, so moving the cache handling to the public method keeps the caching
  benefit for the whole operation.
• enable_cache/disable_cache are plain boolean setters with no nesting
  counter, so a single enable and a single restore around the operation is the
  correct shape.

Verification

• The 6 new tests pass.
• The tests replace _fetch_schema with a stub, so they assert the cache
  contract of fetch_schema. They do not execute the body of _fetch_schema,
  which needs a wiki.
• After merging stage, make check passes and make test reports 872
  passed.

Related

• OSW.load_entity had the same save and restore pattern without a finally.
  fix(core): report dropped entities and restore the cache on error #185 fixed that, and this
  branch contains that change after the merge of stage.

[github-actions]

Release preview

Merging this PR would release v2.9.2 (current: v2.9.1).

Changelog preview (truncated)

## v2.9.2 (2026-11-12)

### Bug Fixes

- Follow properties and items when collecting category templates
  ([#220](https://github.com/OpenSemanticLab/osw-python/pull/220),
  [`55e500e`](https://github.com/OpenSemanticLab/osw-python/commit/55e500efb896f0a3d6bde98409b3a6f43a652bdc))

- Keep the stored jsonschema when store_entity regenerates it
  ([`9b76a8f`](https://github.com/OpenSemanticLab/osw-python/commit/9b76a8fbeb813b34c4881b54d329e9e837b08f95))

- Select category templates from the schema allOf like the wiki
  ([#220](https://github.com/OpenSemanticLab/osw-python/pull/220),
  [`9f606f4`](https://github.com/OpenSemanticLab/osw-python/commit/9f606f48fefd640cca48e6718f1a92eca118da6b))

### Continuous Integration

- Run Main on pushes to stage and Integration on PRs into stage
  ([`1b55f02`](https://github.com/OpenSemanticLab/osw-python/commit/1b55f02c90cae646d690f83d6208c01f0e26e62b))

### Documentation

- State which schema references the template walk follows
  ([#220](https://github.com/OpenSemanticLab/osw-python/pull/220),
  [`799bc07`](https://github.com/OpenSemanticLab/osw-python/commit/799bc07952aac7e6ab579bc127c5cb3000710491))

### Testing

- Drop the FileController type check, it is no longer a model
  ([`1eddbe8`](https://github.com/OpenSemanticLab/osw-python/commit/1eddbe867559e14806ad72eb076172cd41c7767e))

- Set subclass_of for oold 2 in the jsonschema tests
  ([`bd4ffdb`](https://github.com/OpenSemanticLab/osw-python/commit/bd4ffdb3e950f43f4eea0151d19d07f621eb14e0))

_{Preview via python-semantic-release and conventional commits.}