fix(cloudext): do not JSON-encode scalar String property values

[JJUN99]

Symptom

After ingesting data through the local builder (e.g. the supplychain example), every property value except id/name is stored in Neo4j double-encoded with surrounding quotes, e.g. transAmt = "102191" instead of 102191.

Because the reasoner reads raw property values, numeric functions in concept rules (sum, date_diff, ...) silently match 0 rows on such values, so all rule-derived virtual properties (e.g. fundTrans1Month) resolve to null. Returning the value directly raises:

NumberFormatException: For input string: "\"102191\""

Root cause

Neo4jSinkWriter.writeNode/writeEdge JSON-encode any value for which TypeChecker.isArrayOrCollectionOfPrimitives() returns false. That check returns false for scalar strings, and String is also missing from isPrimitiveOrWrapper(), so every string property gets passed through JSON.toJSONString() and picks up an extra pair of quotes. The write side and the read side (reasoner expects raw values) are asymmetric.

Fix

Treat scalar strings as storable as-is, and accept String elements inside arrays/collections for the same reason. Two lines in TypeChecker.

Verification

Applied this change to a running 0.8 server (hot-patched jar), rebuilt the supplychain example: all properties are stored clean, and concept rules computing over numeric string fields (fund transaction aggregates) produce correct non-null values.

[github-actions]

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[JJUN99]

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[JJUN99]

Note on the failing License Validation check: it dies in the dependency-download step (license-eye dependency check → dependencies download error) before any license analysis runs. The same check also fails on unrelated PRs — e.g. the documentation-only #548 — and hasn't passed on any PR since early 2026, so this looks like a repo-wide CI issue rather than something related to this change (no new dependencies, license headers untouched).