Address ds-review-bot v5/v6 review round 8. The prior guards re-read a
stateful getter's value between the check and the spelling, so a getter
returning different values across reads could still emit invalid Python:
- renderConstrainedScalar reads node.const ONCE into a local, then checks and
spells that snapshot; a third-read switch can no longer produce
Literal[[object Object]].
- The enum path snapshots via [...raw] (reading each element exactly once,
covering accessor-property elements) and requires the snapshot be a non-empty
all-scalar array; an emptied re-read no longer spells Literal[], and a
non-array re-read degrades.
- The oneOf branch build guards a non-array or empty re-read to Any instead of
joining to '' (a missing type).
- pyScalar spells null as None; its JSDoc no longer claims null cannot reach it.
Tests cover each re-read shape; py-types.ts stays at 100% coverage.
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