fix(program): check own properties without calling instance methods

[JOJO (moneymaker26754-crypto)]

createModuleTextFromProgram and evaluateJsonProgram throw TypeError when an ordinary literal argument contains a hasOwnProperty data field. Null-prototype call or argument objects fail similarly.

Use Object.prototype.hasOwnProperty.call in the seven program-shape checks, following the existing function-name guard. Four regressions cover generation and evaluation for both input shapes, including the unchanged argument passed to the host callback. Existing unsafe function-name and result-reference tests still pass. Related merged PR #394 handles function names rather than these literal argument fields.

Validation: the four new tests fail on the unchanged source, then npm test passes all 117 tests after the fix. npm run build-all passes for the package and examples. This is offline validation and requires no LLM API key.

Setup note: ordinary npm ci failed in the existing prepare step because examples were built before the root package. Validation used npm ci --ignore-scripts, then npm test to build the root package, followed by npm run build-all. No scripts or dependencies were changed.

AI-assisted draft with regression evidence; human review and refinement are pending.

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[robgruen]

Can we add a null-prototype literal without a hasOwnProperty so the missing-method scenario is it's own test.