**Scope Audited**
- Module wiki visibility config and docs.
- Toolkit wiki expression engine and visibility tests.
- Feat prerequisite rendering/reference behavior.
**Changes Made**
- Added `hidden_ref(Field, "dataset")` and `all_hidden_refs(..., "dataset")` helpers in [wiki_tables.go](/home/vicky/Projects/nwnee-shadowsoverwestgate/toolkit/internal/topdata/wiki_tables.go:914).
- Added feat visibility exclusions in [visibility.yaml](/home/vicky/Projects/nwnee-shadowsoverwestgate/module/topdata/wiki/visibility.yaml:44) for:
- `PREREQFEAT1`
- `PREREQFEAT2`
- `REQSKILL`
- `REQSKILL2`
- `OrReqFeat0..OrReqFeat4`
- Documented the helpers in [README.md](/home/vicky/Projects/nwnee-shadowsoverwestgate/module/topdata/wiki/README.md:53).
- Added coverage in [wiki_native_test.go](/home/vicky/Projects/nwnee-shadowsoverwestgate/toolkit/internal/topdata/wiki_native_test.go:646).
**Configuration/Schema Impact**
- No schema file change. `visibility.yaml` can now use the two new expression helpers.
**Compatibility Impact**
- Existing visibility expressions are unchanged.
- Missing or `****` prerequisite fields are ignored.
- Present references that resolve to hidden or missing wiki rows are treated as unreachable.
**Tests/Validation**
- Confirmed the new test failed before implementation on unknown helper.
- Ran `go test ./internal/topdata -run TestWikiVisibility`.
- Ran `go test ./internal/topdata`.
- Rebuilt toolkit with `./build-tool.sh`.
- Ran module wiki build with local toolkit:
`SOW_TOOLS_DEV_BINARY=../toolkit/tools/sow-toolkit ./build-wiki.sh`
Result: `wiki pages: 771`.
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