`camelCase`'s `toUpperCase()` is a fourth reader of the engine's Unicode
tables, on a table distinct from XID membership and with a wider window: a
tool named U+019B passes `isBareIdentifier` and compiles as `async def` on
CPython 3.9.6, but Node maps the head to U+A7DC and the declared
`class Args` fails there with `invalid non-printable character`. Record it
alongside the three XID read points in the renderer docs and in the note's
CPython-floor obligation, and pin the derivation with a test.
Correct three over-quantified sentences: a `camelCase`-derived class name is
evaluated for every tool but only reaches emitted text when some object shape
in the schema declares a `TypedDict`. Attribute the `str.isidentifier()`
equivalence to `IDENTIFIER` rather than to the predicate, which is
deliberately stricter, and restore the antecedent the mode qualification
dropped.
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