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vm: array element writes via AST delegation for non-local containers

Native OP_ARRAY_SET_LOCAL only covers \`\$local[k] = v\`. Any nested
chain (\`\$a[i][j] = v\`), property array (\`\$obj->arr[i] = v\`),
static-prop array (\`Foo::\$bar[i] = v\`), or compound array write
previously aborted bytecode compile and forced AST fallback for the
entire surrounding function.

Route those LHS shapes through the existing AST-delegation pattern
(OpTryFinally / OpClassConst + OP_REFRESH_SLOTS) and mark the
surrounding body slot-unsafe so the hashtable stays authoritative
while the AST writes through. The simple \`\$local[k] = v\` /
\`\$local[] = v\` statement-context path keeps its native fast path.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

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