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Enable Conductor by default; fix Python None/builtin display and expression-statement coloring in CSE machine (#4159)

* Enable Conductor feature flag by default (#4074)

Most development now happens through Conductor, so flip
conductor.enable's default to true instead of requiring it to be
turned on manually. It can still be disabled via Feature Flags.

* Render Python None as "None" in CSE machine visualizer (#4111)

CseSnapshotAdapter mapped Python's None (label nonetype/none/null)
straight to JS null. PrimitiveValue/Text then stringified it via
String(value), so bindings and stash items showed "null" instead of
"None". Return a source-object sentinel (matching the existing
float/complex pattern) so it renders via toReplString() instead.

* Pin conductor.enable off in tests (CI fix for #4074)

evalCodeSaga branches into evalCodeConductorSaga based on
selectConductorEnable, which now defaults to true. The existing saga/
component test suite exercises the legacy js-slang path and doesn't
stand up a Conductor evaluator/worker, so it started failing with
"no evaluator" once the default flipped. Pin the flag's default off
in the test environment only; tests that specifically exercise the
Conductor path already override it via state/modifiedFlags.

* Fix CSE machine builtin-quoting and add expression-statement coloring

CseSnapshotAdapter's closure branch only handled function-like values that
carried metadata.closureFrameId. Builtins (abs, print, ...) have none, so
they fell through to the generic string fallback, and StashItemComponent's
`typeof val === 'string'` check then wrapped the bare name in quotes as if
it were a Python str value. Render builtins as a plain JS function instead
(picked up by isBuiltInFn()) so the unquoted name displays correctly.

Fixes source-academy/py-slang#302.

Also thread py-slang's new expressionStatement tag (source-academy/py-slang#270)
through to ControlItemComponent so expression-statement control items render
in a di... (continued)

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