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vm: lower unset(\$container[\$key]) natively for simple-local containers

Adds OP_UNSET_DIM + compiler.UnsetArrayDim helper (extracted from
the runArrayAccess.WriteValue value==nil branch). Refuses string-on-
array unset, no-ops on nil containers, otherwise calls
ZArray.OffsetUnset which fires destructors on object elements.

Extends the unset emit to accept array-access-on-simple-local args
alongside simple variables. Nested forms (\$a[\$k1][\$k2]),
object-prop, static-prop, and dyn-name unsets still AST-delegate.

Bodies whose unsets are all supported shapes stay slot-safe.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

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